# Uses of Package
java.util

Packages that use java.util
Package | Description
--- | ---
com.sun.java.accessibility.util | Provides a collection of interfaces and classes that compose the Java Accessibility Utilities.
com.sun.jdi | This is the core package of the Java Debug Interface (JDI), it defines mirrors for values, types, and the target VirtualMachine itself - as well bootstrapping facilities.
com.sun.jdi.connect | This package defines connections between the virtual machine using the JDI and the target virtual machine.
com.sun.jdi.event | This package defines JDI events and event processing.
com.sun.jdi.request | This package is used to request that a JDI event be sent under specified conditions.
com.sun.management | This package contains the JDK's extension to the standard implementation of the `java.lang.management` API and also defines the management interface for some other components of the platform.
com.sun.net.httpserver | Provides a simple high-level Http server API, which can be used to build embedded HTTP servers.
com.sun.nio.sctp | A Java API for Stream Control Transport Protocol.
com.sun.security.auth.module | Provides implementations of `LoginModule`.
com.sun.source.doctree | Provides interfaces to represent documentation comments as abstract syntax trees (AST).
com.sun.source.tree | Provides interfaces to represent source code as abstract syntax trees (AST).
com.sun.source.util | Provides utilities for operations on abstract syntax trees (AST).
com.sun.tools.attach | Provides the API to attach to a Java™ virtual machine.
com.sun.tools.attach.spi | Only developers who are defining new attach providers should need to make direct use of this package.
com.sun.tools.jconsole | This package contains the JConsole API.
java.applet | Provides the classes necessary to create an applet and the classes an applet uses to communicate with its applet context.
java.awt | Contains all of the classes for creating user interfaces and for painting graphics and images.
java.awt.datatransfer | Provides interfaces and classes for transferring data between and within applications.
java.awt.desktop | Provides interfaces and classes for interaction with various desktop capabilities.
java.awt.dnd | Drag and Drop is a direct manipulation gesture found in many Graphical User Interface systems that provides a mechanism to transfer information between two entities logically associated with presentation elements in the GUI.
java.awt.event | Provides interfaces and classes for dealing with different types of events fired by AWT components.
java.awt.font | Provides classes and interface relating to fonts.
java.awt.im | Provides classes and interfaces for the input method framework.
java.awt.im.spi | Provides interfaces that enable the development of input methods that can be used with any Java runtime environment.
java.awt.image | Provides classes for creating and modifying images.
java.awt.image.renderable | Provides classes and interfaces for producing rendering-independent images.
java.beans | Contains classes related to developing beans -- components based on the JavaBeans™ architecture.
java.beans.beancontext | Provides classes and interfaces relating to bean context.
java.io | Provides for system input and output through data streams, serialization and the file system.
java.lang | Provides classes that are fundamental to the design of the Java programming language.
java.lang.constant | Classes and interfaces to represent nominal descriptors for run-time entities such as classes or method handles, and classfile entities such as constant pool entries or `invokedynamic` call sites.
java.lang.instrument | Provides services that allow Java programming language agents to instrument programs running on the JVM.
java.lang.invoke | The `java.lang.invoke` package provides low-level primitives for interacting with the Java Virtual Machine.
java.lang.management | Provides the management interfaces for monitoring and management of the Java virtual machine and other components in the Java runtime.
java.lang.module | Classes to support module descriptors and creating configurations of modules by means of resolution and service binding.
java.math | Provides classes for performing arbitrary-precision integer arithmetic (`BigInteger`) and arbitrary-precision decimal arithmetic (`BigDecimal`).
java.net | Provides the classes for implementing networking applications.
java.net.http | HTTP Client and WebSocket APIs
java.nio.channels | Defines channels, which represent connections to entities that are capable of performing I/O operations, such as files and sockets; defines selectors, for multiplexed, non-blocking I/O operations.
java.nio.channels.spi | Service-provider classes for the `java.nio.channels` package.
java.nio.charset | Defines charsets, decoders, and encoders, for translating between bytes and Unicode characters.
java.nio.charset.spi | Service-provider classes for the `java.nio.charset` package.
java.nio.file | Defines interfaces and classes for the Java virtual machine to access files, file attributes, and file systems.
java.nio.file.attribute | Interfaces and classes providing access to file and file system attributes.
java.nio.file.spi | Service-provider classes for the `java.nio.file` package.
java.rmi.activation | Provides support for RMI Object Activation.
java.security | Provides the classes and interfaces for the security framework.
java.security.cert | Provides classes and interfaces for parsing and managing certificates, certificate revocation lists (CRLs), and certification paths.
java.security.interfaces | Provides interfaces for generating RSA (Rivest, Shamir and Adleman AsymmetricCipher algorithm) keys as defined in the RSA Laboratory Technical Note PKCS#1, and DSA (Digital Signature Algorithm) keys as defined in NIST's FIPS-186.
java.sql | Provides the API for accessing and processing data stored in a data source (usually a relational database) using the Java™ programming language.
java.text | Provides classes and interfaces for handling text, dates, numbers, and messages in a manner independent of natural languages.
java.text.spi | Service provider classes for the classes in the java.text package.
java.time | The main API for dates, times, instants, and durations.
java.time.chrono | Generic API for calendar systems other than the default ISO.
java.time.format | Provides classes to print and parse dates and times.
java.time.temporal | Access to date and time using fields and units, and date time adjusters.
java.time.zone | Support for time-zones and their rules.
java.util | Contains the collections framework, some internationalization support classes, a service loader, properties, random number generation, string parsing and scanning classes, base64 encoding and decoding, a bit array, and several miscellaneous utility classes.
java.util.concurrent | Utility classes commonly useful in concurrent programming.
java.util.concurrent.locks | Interfaces and classes providing a framework for locking and waiting for conditions that is distinct from built-in synchronization and monitors.
java.util.function | Functional interfaces provide target types for lambda expressions and method references.
java.util.jar | Provides classes for reading and writing the JAR (Java ARchive) file format, which is based on the standard ZIP file format with an optional manifest file.
java.util.logging | Provides the classes and interfaces of the Java™ 2 platform's core logging facilities.
java.util.prefs | This package allows applications to store and retrieve user and system preference and configuration data.
java.util.spi | Service provider classes for the classes in the java.util package.
java.util.stream | Classes to support functional-style operations on streams of elements, such as map-reduce transformations on collections.
java.util.zip | Provides classes for reading and writing the standard ZIP and GZIP file formats.
javax.accessibility | Defines a contract between user-interface components and an assistive technology that provides access to those components.
javax.annotation.processing | Facilities for declaring annotation processors and for allowing annotation processors to communicate with an annotation processing tool environment.
javax.imageio | The main package of the Java Image I/O API.
javax.imageio.event | A package of the Java Image I/O API dealing with synchronous notification of events during the reading and writing of images.
javax.imageio.metadata | A package of the Java Image I/O API dealing with reading and writing metadata.
javax.imageio.plugins.bmp | Package containing the public classes used by the built-in BMP plug-in.
javax.imageio.plugins.jpeg | Classes supporting the built-in JPEG plug-in.
javax.imageio.plugins.tiff | Public classes used by the built-in TIFF plug-ins.
javax.imageio.spi | A package of the Java Image I/O API containing the plug-in interfaces for readers, writers, transcoders, and streams, and a runtime registry.
javax.lang.model | Types and hierarchies of packages comprising a Java language model, a model of the declarations and types of the Java programming language.
javax.lang.model.element | Interfaces used to model elements of the Java programming language.
javax.lang.model.type | Interfaces used to model Java programming language types.
javax.lang.model.util | Utilities to assist in the processing of program elements and types.
javax.management | Provides the core classes for the Java Management Extensions.
javax.management.loading | Provides the classes which implement advanced dynamic loading.
javax.management.monitor | Provides the definition of the monitor classes.
javax.management.openmbean | Provides the open data types and Open MBean descriptor classes.
javax.management.relation | Provides the definition of the Relation Service.
javax.management.remote | Interfaces for remote access to JMX MBean servers.
javax.management.remote.rmi | The RMI connector is a connector for the JMX Remote API that uses RMI to transmit client requests to a remote MBean server.
javax.management.timer | Provides the definition of the Timer MBean.
javax.naming | Provides the classes and interfaces for accessing naming services.
javax.naming.directory | Extends the `javax.naming` package to provide functionality for accessing directory services.
javax.naming.event | Provides support for event notification when accessing naming and directory services.
javax.naming.ldap | Provides support for LDAPv3 extended operations and controls.
javax.naming.ldap.spi |
javax.naming.spi | Provides the means for dynamically plugging in support for accessing naming and directory services through the `javax.naming` and related packages.
javax.net.ssl | Provides classes for the secure socket package.
javax.print.attribute | Provides classes and interfaces that describe the types of Java™ Print Service attributes and how they can be collected into attribute sets.
javax.print.attribute.standard | Package `javax.print.attribute.standard` contains classes for specific printing attributes.
javax.print.event | Package `javax.print.event` contains event classes and listener interfaces.
javax.script | The scripting API consists of interfaces and classes that define Java™ Scripting Engines and provides a framework for their use in Java applications.
javax.security.auth | This package provides a framework for authentication and authorization.
javax.security.auth.callback | This package provides the classes necessary for services to interact with applications in order to retrieve information (authentication data including usernames or passwords, for example) or to display information (error and warning messages, for example).
javax.security.auth.kerberos | This package contains utility classes related to the Kerberos network authentication protocol.
javax.security.auth.login | This package provides a pluggable authentication framework.
javax.security.auth.spi | This package provides the interface to be used for implementing pluggable authentication modules.
javax.security.auth.x500 | This package contains the classes that should be used to store X500 Principal and X500 Private Credentials in a Subject.
javax.security.cert | Provides classes for public key certificates.
javax.security.sasl | Contains class and interfaces for supporting SASL.
javax.smartcardio | Java™ Smart Card I/O API.
javax.sound.midi | Provides interfaces and classes for I/O, sequencing, and synthesis of MIDI (Musical Instrument Digital Interface) data.
javax.sound.sampled | Provides interfaces and classes for capture, processing, and playback of sampled audio data.
javax.sql | Provides the API for server side data source access and processing from the Java™ programming language.
javax.sql.rowset | Standard interfaces and base classes for JDBC `RowSet` implementations.
javax.sql.rowset.serial | Provides utility classes to allow serializable mappings between SQL types and data types in the Java programming language.
javax.sql.rowset.spi | The standard classes and interfaces that a third party vendor has to use in its implementation of a synchronization provider.
javax.swing | Provides a set of "lightweight" (all-Java language) components that, to the maximum degree possible, work the same on all platforms.
javax.swing.event | Provides for events fired by Swing components.
javax.swing.plaf.basic | Provides user interface objects built according to the Basic look and feel.
javax.swing.plaf.metal | Provides user interface objects built according to the Java look and feel (once codenamed Metal), which is the default look and feel.
javax.swing.plaf.multi | Provides user interface objects that combine two or more look and feels.
javax.swing.plaf.synth | Synth is a skinnable look and feel in which all painting is delegated.
javax.swing.table | Provides classes and interfaces for dealing with `javax.swing.JTable`.
javax.swing.text | Provides classes and interfaces that deal with editable and noneditable text components.
javax.swing.text.html | Provides the class `HTMLEditorKit` and supporting classes for creating HTML text editors.
javax.swing.text.html.parser | Provides the default HTML parser, along with support classes.
javax.swing.tree | Provides classes and interfaces for dealing with `javax.swing.JTree`.
javax.swing.undo | Allows developers to provide support for undo/redo in applications such as text editors.
javax.tools | Provides interfaces for tools which can be invoked from a program, for example, compilers.
javax.xml.crypto | Common classes for XML cryptography.
javax.xml.crypto.dom | DOM-specific classes for the `javax.xml.crypto` package.
javax.xml.crypto.dsig | Classes for generating and validating XML digital signatures.
javax.xml.crypto.dsig.keyinfo | Classes for parsing and processing `KeyInfo` elements and structures.
javax.xml.crypto.dsig.spec | Parameter classes for XML digital signatures.
javax.xml.datatype | Defines XML/Java Type Mappings.
javax.xml.namespace | Defines XML Namespace processing.
javax.xml.stream | Defines interfaces and classes for the Streaming API for XML (StAX).
javax.xml.stream.events | Defines event interfaces for the Streaming API for XML (StAX).
javax.xml.stream.util | Provides utility classes for the Streaming API for XML (StAX).
javax.xml.transform | Defines the generic APIs for processing transformation instructions, and performing a transformation from source to result.
javax.xml.xpath | Provides an object-model neutral API for the evaluation of XPath expressions and access to the evaluation environment.
jdk.dynalink | Contains interfaces and classes that are used to link an `invokedynamic` call site.
jdk.dynalink.beans | Contains the linker for ordinary Java objects.
jdk.dynalink.linker | Contains interfaces and classes needed by language runtimes to implement their own language-specific object models and type conversions.
jdk.dynalink.linker.support | Contains classes that make it more convenient for language runtimes to implement their own language-specific object models and type conversions by providing basic implementations of some classes as well as various utilities.
jdk.javadoc.doclet | The Doclet API provides an environment which, in conjunction with the Language Model API and Compiler Tree API, allows clients to inspect the source-level structures of programs and libraries, including API comments embedded in the source.
jdk.jfr | This package provides classes to create events and control Flight Recorder.
jdk.jfr.consumer | This package contains classes for consuming Flight Recorder data.
jdk.jshell | Provides interfaces for creating tools, such as a Read-Eval-Print Loop (REPL), which interactively evaluate "snippets" of Java programming language code.
jdk.jshell.execution | Provides implementation support for building JShell execution engines.
jdk.jshell.spi | Defines the Service Provider Interface for pluggable JShell execution engines.
jdk.jshell.tool | Provides a mechanism to launch an instance of a Java™ shell tool.
jdk.management.jfr | This package contains classes to control and monitor Flight Recorder over Java Management Extensions (JMX).
jdk.nashorn.api.scripting | This package provides the `javax.script` integration, which is the preferred way to use Nashorn.
jdk.nashorn.api.tree | Nashorn parser API provides interfaces to represent ECMAScript source code as abstract syntax trees (AST) and Parser to parse ECMAScript source scripts.
jdk.net | Platform specific socket options for the `java.net` and `java.nio.channels` socket classes.
org.xml.sax | Provides the interfaces for the Simple API for XML (SAX).
org.xml.sax.helpers | Provides helper classes, including support for bootstrapping SAX-based applications.

- Classes in java.util used by com.sun.java.accessibility.util
  Class | Description
  --- | ---
  EventListener | A tagging interface that all event listener interfaces must extend.
  Locale | A `Locale` object represents a specific geographical, political, or cultural region.

- Classes in java.util used by com.sun.jdi
  Class | Description
  --- | ---
  List | An ordered collection (also known as a sequence).
  Map | An object that maps keys to values.

- Classes in java.util used by com.sun.jdi.connect
  Class | Description
  --- | ---
  List | An ordered collection (also known as a sequence).
  Map | An object that maps keys to values.

- Classes in java.util used by com.sun.jdi.event
  Class | Description
  --- | ---
  Collection | The root interface in the collection hierarchy.
  Iterator | An iterator over a collection.
  Set | A collection that contains no duplicate elements.

- Classes in java.util used by com.sun.jdi.request
  Class | Description
  --- | ---
  List | An ordered collection (also known as a sequence).

- Classes in java.util used by com.sun.management
  Class | Description
  --- | ---
  List | An ordered collection (also known as a sequence).
  Map | An object that maps keys to values.

- Classes in java.util used by com.sun.net.httpserver
  Class | Description
  --- | ---
  List | An ordered collection (also known as a sequence).
  Map | An object that maps keys to values.

- Classes in java.util used by com.sun.nio.sctp
  Class | Description
  --- | ---
  Set | A collection that contains no duplicate elements.

- Classes in java.util used by com.sun.security.auth.module
  Class | Description
  --- | ---
  Map | An object that maps keys to values.

- Classes in java.util used by com.sun.source.doctree
  Class | Description
  --- | ---
  List | An ordered collection (also known as a sequence).

- Classes in java.util used by com.sun.source.tree
  Class | Description
  --- | ---
  List | An ordered collection (also known as a sequence).
  Set | A collection that contains no duplicate elements.

- Classes in java.util used by com.sun.source.util
  Class | Description
  --- | ---
  Iterator | An iterator over a collection.
  List | An ordered collection (also known as a sequence).

- Classes in java.util used by com.sun.tools.attach
  Class | Description
  --- | ---
  List | An ordered collection (also known as a sequence).
  Properties | The `Properties` class represents a persistent set of properties.

- Classes in java.util used by com.sun.tools.attach.spi
  Class | Description
  --- | ---
  List | An ordered collection (also known as a sequence).

- Classes in java.util used by com.sun.tools.jconsole
  Class | Description
  --- | ---
  Map | An object that maps keys to values.

- Classes in java.util used by java.applet
  Class | Description
  --- | ---
  Enumeration | An object that implements the Enumeration interface generates a series of elements, one at a time.
  Iterator | An iterator over a collection.
  Locale | A `Locale` object represents a specific geographical, political, or cultural region.

- Classes in java.util used by java.awt
  Class | Description
  --- | ---
  Collection | The root interface in the collection hierarchy.
  EmptyStackException | Thrown by methods in the `Stack` class to indicate that the stack is empty.
  Enumeration | An object that implements the Enumeration interface generates a series of elements, one at a time.
  EventListener | A tagging interface that all event listener interfaces must extend.
  EventObject | The root class from which all event state objects shall be derived.
  Hashtable | This class implements a hash table, which maps keys to values.
  List | An ordered collection (also known as a sequence).
  Locale | A `Locale` object represents a specific geographical, political, or cultural region.
  Map | An object that maps keys to values.
  Map.Entry | A map entry (key-value pair).
  Properties | The `Properties` class represents a persistent set of properties.
  ResourceBundle | Resource bundles contain locale-specific objects.
  Set | A collection that contains no duplicate elements.

- Classes in java.util used by java.awt.datatransfer
  Class | Description
  --- | ---
  EventListener | A tagging interface that all event listener interfaces must extend.
  EventObject | The root class from which all event state objects shall be derived.
  List | An ordered collection (also known as a sequence).
  Map | An object that maps keys to values.

- Classes in java.util used by java.awt.desktop
  Class | Description
  --- | ---
  EventListener | A tagging interface that all event listener interfaces must extend.
  EventObject | The root class from which all event state objects shall be derived.
  List | An ordered collection (also known as a sequence).

- Classes in java.util used by java.awt.dnd
  Class | Description
  --- | ---
  ArrayList | Resizable-array implementation of the `List` interface.
  EventListener | A tagging interface that all event listener interfaces must extend.
  EventObject | The root class from which all event state objects shall be derived.
  Iterator | An iterator over a collection.
  List | An ordered collection (also known as a sequence).
  TooManyListenersException | The `TooManyListenersException` Exception is used as part of the Java Event model to annotate and implement a unicast special case of a multicast Event Source.

- Classes in java.util used by java.awt.event
  Class | Description
  --- | ---
  EventListener | A tagging interface that all event listener interfaces must extend.
  EventListenerProxy | An abstract wrapper class for an `EventListener` class which associates a set of additional parameters with the listener.
  EventObject | The root class from which all event state objects shall be derived.

- Classes in java.util used by java.awt.font
  Class | Description
  --- | ---
  Map | An object that maps keys to values.
  Set | A collection that contains no duplicate elements.

- Classes in java.util used by java.awt.im
  Class | Description
  --- | ---
  Locale | A `Locale` object represents a specific geographical, political, or cultural region.
  Map | An object that maps keys to values.

- Classes in java.util used by java.awt.im.spi
  Class | Description
  --- | ---
  Locale | A `Locale` object represents a specific geographical, political, or cultural region.

- Classes in java.util used by java.awt.image
  Class | Description
  --- | ---
  Hashtable | This class implements a hash table, which maps keys to values.
  List | An ordered collection (also known as a sequence).
  Vector | The `Vector` class implements a growable array of objects.

- Classes in java.util used by java.awt.image.renderable
  Class | Description
  --- | ---
  Vector | The `Vector` class implements a growable array of objects.

- Classes in java.util used by java.beans
  Class | Description
  --- | ---
  Enumeration | An object that implements the Enumeration interface generates a series of elements, one at a time.
  EventListener | A tagging interface that all event listener interfaces must extend.
  EventListenerProxy | An abstract wrapper class for an `EventListener` class which associates a set of additional parameters with the listener.
  EventObject | The root class from which all event state objects shall be derived.

- Classes in java.util used by java.beans.beancontext
  Class | Description
  --- | ---
  ArrayList | Resizable-array implementation of the `List` interface.
  Collection | The root interface in the collection hierarchy.
  EventListener | A tagging interface that all event listener interfaces must extend.
  EventObject | The root class from which all event state objects shall be derived.
  HashMap | Hash table based implementation of the `Map` interface.
  Iterator | An iterator over a collection.
  Locale | A `Locale` object represents a specific geographical, political, or cultural region.
  TooManyListenersException | The `TooManyListenersException` Exception is used as part of the Java Event model to annotate and implement a unicast special case of a multicast Event Source.

- Classes in java.util used by java.io
  Class | Description
  --- | ---
  Enumeration | An object that implements the Enumeration interface generates a series of elements, one at a time.
  Locale | A `Locale` object represents a specific geographical, political, or cultural region.

- Classes in java.util used by java.lang
  Class | Description
  --- | ---
  Comparator | A comparison function, which imposes a total ordering on some collection of objects.
  Enumeration | An object that implements the Enumeration interface generates a series of elements, one at a time.
  Iterator | An iterator over a collection.
  List | An ordered collection (also known as a sequence).
  Locale | A `Locale` object represents a specific geographical, political, or cultural region.
  Map | An object that maps keys to values.
  Optional | A container object which may or may not contain a non-`null` value.
  Properties | The `Properties` class represents a persistent set of properties.
  ResourceBundle | Resource bundles contain locale-specific objects.
  Set | A collection that contains no duplicate elements.
  Spliterator | An object for traversing and partitioning elements of a source.

- Classes in java.util used by java.lang.constant
  Class | Description
  --- | ---
  List | An ordered collection (also known as a sequence).
  Optional | A container object which may or may not contain a non-`null` value.

- Classes in java.util used by java.lang.instrument
  Class | Description
  --- | ---
  Map | An object that maps keys to values.
  Set | A collection that contains no duplicate elements.

- Classes in java.util used by java.lang.invoke
  Class | Description
  --- | ---
  List | An ordered collection (also known as a sequence).
  Optional | A container object which may or may not contain a non-`null` value.

- Classes in java.util used by java.lang.management
  Class | Description
  --- | ---
  List | An ordered collection (also known as a sequence).
  Map | An object that maps keys to values.
  Set | A collection that contains no duplicate elements.

- Classes in java.util used by java.lang.module
  Class | Description
  --- | ---
  Collection | The root interface in the collection hierarchy.
  List | An ordered collection (also known as a sequence).
  Optional | A container object which may or may not contain a non-`null` value.
  Set | A collection that contains no duplicate elements.

- Classes in java.util used by java.math
  Class | Description
  --- | ---
  Random | An instance of this class is used to generate a stream of pseudorandom numbers.

- Classes in java.util used by java.net
  Class | Description
  --- | ---
  Enumeration | An object that implements the Enumeration interface generates a series of elements, one at a time.
  List | An ordered collection (also known as a sequence).
  Map | An object that maps keys to values.
  Optional | A container object which may or may not contain a non-`null` value.
  Set | A collection that contains no duplicate elements.

- Classes in java.util used by java.net.http
  Class | Description
  --- | ---
  List | An ordered collection (also known as a sequence).
  Map | An object that maps keys to values.
  Optional | A container object which may or may not contain a non-`null` value.
  OptionalLong | A container object which may or may not contain a `long` value.

- Classes in java.util used by java.nio.channels
  Class | Description
  --- | ---
  Set | A collection that contains no duplicate elements.

- Classes in java.util used by java.nio.channels.spi
  Class | Description
  --- | ---
  Set | A collection that contains no duplicate elements.

- Classes in java.util used by java.nio.charset
  Class | Description
  --- | ---
  Locale | A `Locale` object represents a specific geographical, political, or cultural region.
  Set | A collection that contains no duplicate elements.
  SortedMap | A `Map` that further provides a total ordering on its keys.

- Classes in java.util used by java.nio.charset.spi
  Class | Description
  --- | ---
  Iterator | An iterator over a collection.

- Classes in java.util used by java.nio.file
  Class | Description
  --- | ---
  ConcurrentModificationException | This exception may be thrown by methods that have detected concurrent modification of an object when such modification is not permissible.
  Iterator | An iterator over a collection.
  List | An ordered collection (also known as a sequence).
  Map | An object that maps keys to values.
  Set | A collection that contains no duplicate elements.

- Classes in java.util used by java.nio.file.attribute
  Class | Description
  --- | ---
  List | An ordered collection (also known as a sequence).
  Set | A collection that contains no duplicate elements.

- Classes in java.util used by java.nio.file.spi
  Class | Description
  --- | ---
  List | An ordered collection (also known as a sequence).
  Map | An object that maps keys to values.
  Set | A collection that contains no duplicate elements.

- Classes in java.util used by java.rmi.activation
  Class | Description
  --- | ---
  Properties | The `Properties` class represents a persistent set of properties.

- Classes in java.util used by java.security
  Class | Description
  --- | ---
  Collection | The root interface in the collection hierarchy.
  Date | The class `Date` represents a specific instant in time, with millisecond precision.
  Dictionary | The `Dictionary` class is the abstract parent of any class, such as `Hashtable`, which maps keys to values.
  Enumeration | An object that implements the Enumeration interface generates a series of elements, one at a time.
  Hashtable | This class implements a hash table, which maps keys to values.
  List | An ordered collection (also known as a sequence).
  Map | An object that maps keys to values.
  Map.Entry | A map entry (key-value pair).
  Properties | The `Properties` class represents a persistent set of properties.
  Random | An instance of this class is used to generate a stream of pseudorandom numbers.
  Set | A collection that contains no duplicate elements.

- Classes in java.util used by java.security.cert
  Class | Description
  --- | ---
  Collection | The root interface in the collection hierarchy.
  Date | The class `Date` represents a specific instant in time, with millisecond precision.
  Iterator | An iterator over a collection.
  List | An ordered collection (also known as a sequence).
  Map | An object that maps keys to values.
  Set | A collection that contains no duplicate elements.

- Classes in java.util used by java.security.interfaces
  Class | Description
  --- | ---
  Optional | A container object which may or may not contain a non-`null` value.

- Classes in java.util used by java.sql
  Class | Description
  --- | ---
  Calendar | The `Calendar` class is an abstract class that provides methods for converting between a specific instant in time and a set of `calendar fields` such as `YEAR`, `MONTH`, `DAY_OF_MONTH`, `HOUR`, and so on, and for manipulating the calendar fields, such as getting the date of the next week.
  Date | The class `Date` represents a specific instant in time, with millisecond precision.
  Enumeration | An object that implements the Enumeration interface generates a series of elements, one at a time.
  Iterator | An iterator over a collection.
  Map | An object that maps keys to values.
  Properties | The `Properties` class represents a persistent set of properties.

- Classes in java.util used by java.text
  Class | Description
  --- | ---
  Calendar | The `Calendar` class is an abstract class that provides methods for converting between a specific instant in time and a set of `calendar fields` such as `YEAR`, `MONTH`, `DAY_OF_MONTH`, `HOUR`, and so on, and for manipulating the calendar fields, such as getting the date of the next week.
  Comparator | A comparison function, which imposes a total ordering on some collection of objects.
  Currency | Represents a currency.
  Date | The class `Date` represents a specific instant in time, with millisecond precision.
  Locale | A `Locale` object represents a specific geographical, political, or cultural region.
  Map | An object that maps keys to values.
  Set | A collection that contains no duplicate elements.
  TimeZone | `TimeZone` represents a time zone offset, and also figures out daylight savings.

- Classes in java.util used by java.text.spi
  Class | Description
  --- | ---
  Locale | A `Locale` object represents a specific geographical, political, or cultural region.

- Classes in java.util used by java.time
  Class | Description
  --- | ---
  Comparator | A comparison function, which imposes a total ordering on some collection of objects.
  List | An ordered collection (also known as a sequence).
  Locale | A `Locale` object represents a specific geographical, political, or cultural region.
  Map | An object that maps keys to values.
  Set | A collection that contains no duplicate elements.

- Classes in java.util used by java.time.chrono
  Class | Description
  --- | ---
  Comparator | A comparison function, which imposes a total ordering on some collection of objects.
  List | An ordered collection (also known as a sequence).
  Locale | A `Locale` object represents a specific geographical, political, or cultural region.
  Map | An object that maps keys to values.
  Set | A collection that contains no duplicate elements.

- Classes in java.util used by java.time.format
  Class | Description
  --- | ---
  Locale | A `Locale` object represents a specific geographical, political, or cultural region.
  Map | An object that maps keys to values.
  Set | A collection that contains no duplicate elements.

- Classes in java.util used by java.time.temporal
  Class | Description
  --- | ---
  List | An ordered collection (also known as a sequence).
  Locale | A `Locale` object represents a specific geographical, political, or cultural region.
  Map | An object that maps keys to values.

- Classes in java.util used by java.time.zone
  Class | Description
  --- | ---
  List | An ordered collection (also known as a sequence).
  NavigableMap | A `SortedMap` extended with navigation methods returning the closest matches for given search targets.
  Set | A collection that contains no duplicate elements.

- Classes in java.util used by java.util
  Class | Description
  --- | ---
  AbstractCollection | This class provides a skeletal implementation of the `Collection` interface, to minimize the effort required to implement this interface.
  AbstractList | This class provides a skeletal implementation of the `List` interface to minimize the effort required to implement this interface backed by a "random access" data store (such as an array).
  AbstractMap | This class provides a skeletal implementation of the `Map` interface, to minimize the effort required to implement this interface.
  AbstractQueue | This class provides skeletal implementations of some `Queue` operations.
  AbstractSequentialList | This class provides a skeletal implementation of the `List` interface to minimize the effort required to implement this interface backed by a "sequential access" data store (such as a linked list).
  AbstractSet | This class provides a skeletal implementation of the `Set` interface to minimize the effort required to implement this interface.
  ArrayDeque | Resizable-array implementation of the `Deque` interface.
  ArrayList | Resizable-array implementation of the `List` interface.
  Base64.Decoder | This class implements a decoder for decoding byte data using the Base64 encoding scheme as specified in RFC 4648 and RFC 2045.
  Base64.Encoder | This class implements an encoder for encoding byte data using the Base64 encoding scheme as specified in RFC 4648 and RFC 2045.
  BitSet | This class implements a vector of bits that grows as needed.
  Calendar | The `Calendar` class is an abstract class that provides methods for converting between a specific instant in time and a set of `calendar fields` such as `YEAR`, `MONTH`, `DAY_OF_MONTH`, `HOUR`, and so on, and for manipulating the calendar fields, such as getting the date of the next week.
  Calendar.Builder | `Calendar.Builder` is used for creating a `Calendar` from various date-time parameters.
  Collection | The root interface in the collection hierarchy.
  Comparator | A comparison function, which imposes a total ordering on some collection of objects.
  Currency | Represents a currency.
  Date | The class `Date` represents a specific instant in time, with millisecond precision.
  Deque | A linear collection that supports element insertion and removal at both ends.
  Dictionary | The `Dictionary` class is the abstract parent of any class, such as `Hashtable`, which maps keys to values.
  DoubleSummaryStatistics | A state object for collecting statistics such as count, min, max, sum, and average.
  Enumeration | An object that implements the Enumeration interface generates a series of elements, one at a time.
  EnumMap | A specialized `Map` implementation for use with enum type keys.
  EnumSet | A specialized `Set` implementation for use with enum types.
  EventListener | A tagging interface that all event listener interfaces must extend.
  Formatter | An interpreter for printf-style format strings.
  Formatter.BigDecimalLayoutForm | Enum for `BigDecimal` formatting.
  GregorianCalendar | `GregorianCalendar` is a concrete subclass of `Calendar` and provides the standard calendar system used by most of the world.
  HashMap | Hash table based implementation of the `Map` interface.
  HashSet | This class implements the `Set` interface, backed by a hash table (actually a `HashMap` instance).
  Hashtable | This class implements a hash table, which maps keys to values.
  IllegalFormatException | Unchecked exception thrown when a format string contains an illegal syntax or a format specifier that is incompatible with the given arguments.
  IntSummaryStatistics | A state object for collecting statistics such as count, min, max, sum, and average.
  InvalidPropertiesFormatException | Thrown to indicate that an operation could not complete because the input did not conform to the appropriate XML document type for a collection of properties, as per the `Properties` specification.
  Iterator | An iterator over a collection.
  List | An ordered collection (also known as a sequence).
  ListIterator | An iterator for lists that allows the programmer to traverse the list in either direction, modify the list during iteration, and obtain the iterator's current position in the list.
  Locale | A `Locale` object represents a specific geographical, political, or cultural region.
  Locale.Builder | `Builder` is used to build instances of `Locale` from values configured by the setters.
  Locale.Category | Enum for locale categories.
  Locale.FilteringMode | This enum provides constants to select a filtering mode for locale matching.
  Locale.IsoCountryCode | Enum for specifying the type defined in ISO 3166.
  Locale.LanguageRange | This class expresses a Language Range defined in RFC 4647 Matching of Language Tags.
  LongSummaryStatistics | A state object for collecting statistics such as count, min, max, sum, and average.
  Map | An object that maps keys to values.
  Map.Entry | A map entry (key-value pair).
  MissingResourceException | Signals that a resource is missing.
  NavigableMap | A `SortedMap` extended with navigation methods returning the closest matches for given search targets.
  NavigableSet | A `SortedSet` extended with navigation methods reporting closest matches for given search targets.
  NoSuchElementException | Thrown by various accessor methods to indicate that the element being requested does not exist.
  Observable | Deprecated. This class and the `Observer` interface have been deprecated.
  Observer | Deprecated. This interface has been deprecated.
  Optional | A container object which may or may not contain a non-`null` value.
  OptionalDouble | A container object which may or may not contain a `double` value.
  OptionalInt | A container object which may or may not contain an `int` value.
  OptionalLong | A container object which may or may not contain a `long` value.
  PrimitiveIterator | A base type for primitive specializations of `Iterator`.
  PrimitiveIterator.OfDouble | An Iterator specialized for `double` values.
  PrimitiveIterator.OfInt | An Iterator specialized for `int` values.
  PrimitiveIterator.OfLong | An Iterator specialized for `long` values.
  PriorityQueue | An unbounded priority queue based on a priority heap.
  Properties | The `Properties` class represents a persistent set of properties.
  Queue | A collection designed for holding elements prior to processing.
  Random | An instance of this class is used to generate a stream of pseudorandom numbers.
  RandomAccess | Marker interface used by `List` implementations to indicate that they support fast (generally constant time) random access.
  ResourceBundle | Resource bundles contain locale-specific objects.
  ResourceBundle.Control | `ResourceBundle.Control` defines a set of callback methods that are invoked by the `ResourceBundle.getBundle` factory methods during the bundle loading process.
  Scanner | A simple text scanner which can parse primitive types and strings using regular expressions.
  ServiceLoader | A facility to load implementations of a service.
  ServiceLoader.Provider | Represents a service provider located by `ServiceLoader`.
  Set | A collection that contains no duplicate elements.
  SortedMap | A `Map` that further provides a total ordering on its keys.
  SortedSet | A `Set` that further provides a total ordering on its elements.
  Spliterator | An object for traversing and partitioning elements of a source.
  Spliterator.OfDouble | A Spliterator specialized for `double` values.
  Spliterator.OfInt | A Spliterator specialized for `int` values.
  Spliterator.OfLong | A Spliterator specialized for `long` values.
  Spliterator.OfPrimitive | A Spliterator specialized for primitive values.
  SplittableRandom | A generator of uniform pseudorandom values applicable for use in (among other contexts) isolated parallel computations that may generate subtasks.
  StringJoiner | `StringJoiner` is used to construct a sequence of characters separated by a delimiter and optionally starting with a supplied prefix and ending with a supplied suffix.
  TimerTask | A task that can be scheduled for one-time or repeated execution by a `Timer`.
  TimeZone | `TimeZone` represents a time zone offset, and also figures out daylight savings.
  UUID | A class that represents an immutable universally unique identifier (UUID).
  Vector | The `Vector` class implements a growable array of objects.

- Classes in java.util used by java.util.concurrent
  Class | Description
  --- | ---
  AbstractCollection | This class provides a skeletal implementation of the `Collection` interface, to minimize the effort required to implement this interface.
  AbstractMap | This class provides a skeletal implementation of the `Map` interface, to minimize the effort required to implement this interface.
  AbstractQueue | This class provides skeletal implementations of some `Queue` operations.
  AbstractSet | This class provides a skeletal implementation of the `Set` interface to minimize the effort required to implement this interface.
  Collection | The root interface in the collection hierarchy.
  Comparator | A comparison function, which imposes a total ordering on some collection of objects.
  Deque | A linear collection that supports element insertion and removal at both ends.
  Enumeration | An object that implements the Enumeration interface generates a series of elements, one at a time.
  Iterator | An iterator over a collection.
  List | An ordered collection (also known as a sequence).
  ListIterator | An iterator for lists that allows the programmer to traverse the list in either direction, modify the list during iteration, and obtain the iterator's current position in the list.
  Map | An object that maps keys to values.
  Map.Entry | A map entry (key-value pair).
  NavigableMap | A `SortedMap` extended with navigation methods returning the closest matches for given search targets.
  NavigableSet | A `SortedSet` extended with navigation methods reporting closest matches for given search targets.
  Queue | A collection designed for holding elements prior to processing.
  Random | An instance of this class is used to generate a stream of pseudorandom numbers.
  RandomAccess | Marker interface used by `List` implementations to indicate that they support fast (generally constant time) random access.
  Set | A collection that contains no duplicate elements.
  SortedMap | A `Map` that further provides a total ordering on its keys.
  SortedSet | A `Set` that further provides a total ordering on its elements.
  Spliterator | An object for traversing and partitioning elements of a source.

- Classes in java.util used by java.util.concurrent.locks
  Class | Description
  --- | ---
  Collection | The root interface in the collection hierarchy.
  Date | The class `Date` represents a specific instant in time, with millisecond precision.

- Classes in java.util used by java.util.function
  Class | Description
  --- | ---
  Comparator | A comparison function, which imposes a total ordering on some collection of objects.

- Classes in java.util used by java.util.jar
  Class | Description
  --- | ---
  Collection | The root interface in the collection hierarchy.
  Enumeration | An object that implements the Enumeration interface generates a series of elements, one at a time.
  Map | An object that maps keys to values.
  Map.Entry | A map entry (key-value pair).
  Set | A collection that contains no duplicate elements.
  SortedMap | A `Map` that further provides a total ordering on its keys.

- Classes in java.util used by java.util.logging
  Class | Description
  --- | ---
  Enumeration | An object that implements the Enumeration interface generates a series of elements, one at a time.
  List | An ordered collection (also known as a sequence).
  ResourceBundle | Resource bundles contain locale-specific objects.

- Classes in java.util used by java.util.prefs
  Class | Description
  --- | ---
  EventListener | A tagging interface that all event listener interfaces must extend.
  EventObject | The root class from which all event state objects shall be derived.

- Classes in java.util used by java.util.spi
  Class | Description
  --- | ---
  Locale | A `Locale` object represents a specific geographical, political, or cultural region.
  Map | An object that maps keys to values.
  Optional | A container object which may or may not contain a non-`null` value.
  ResourceBundle | Resource bundles contain locale-specific objects.
  ResourceBundle.Control | `ResourceBundle.Control` defines a set of callback methods that are invoked by the `ResourceBundle.getBundle` factory methods during the bundle loading process.

- Classes in java.util used by java.util.stream
  Class | Description
  --- | ---
  Collection | The root interface in the collection hierarchy.
  Comparator | A comparison function, which imposes a total ordering on some collection of objects.
  DoubleSummaryStatistics | A state object for collecting statistics such as count, min, max, sum, and average.
  IntSummaryStatistics | A state object for collecting statistics such as count, min, max, sum, and average.
  Iterator | An iterator over a collection.
  List | An ordered collection (also known as a sequence).
  LongSummaryStatistics | A state object for collecting statistics such as count, min, max, sum, and average.
  Map | An object that maps keys to values.
  Optional | A container object which may or may not contain a non-`null` value.
  OptionalDouble | A container object which may or may not contain a `double` value.
  OptionalInt | A container object which may or may not contain an `int` value.
  OptionalLong | A container object which may or may not contain a `long` value.
  Set | A collection that contains no duplicate elements.
  Spliterator | An object for traversing and partitioning elements of a source.
  Spliterator.OfDouble | A Spliterator specialized for `double` values.
  Spliterator.OfInt | A Spliterator specialized for `int` values.
  Spliterator.OfLong | A Spliterator specialized for `long` values.

- Classes in java.util used by java.util.zip
  Class | Description
  --- | ---
  Enumeration | An object that implements the Enumeration interface generates a series of elements, one at a time.

- Classes in java.util used by javax.accessibility
  Class | Description
  --- | ---
  ListResourceBundle | `ListResourceBundle` is an abstract subclass of `ResourceBundle` that manages resources for a locale in a convenient and easy to use list.
  Locale | A `Locale` object represents a specific geographical, political, or cultural region.
  ResourceBundle | Resource bundles contain locale-specific objects.
  Vector | The `Vector` class implements a growable array of objects.

- Classes in java.util used by javax.annotation.processing
  Class | Description
  --- | ---
  Locale | A `Locale` object represents a specific geographical, political, or cultural region.
  Map | An object that maps keys to values.
  Set | A collection that contains no duplicate elements.

- Classes in java.util used by javax.imageio
  Class | Description
  --- | ---
  Iterator | An iterator over a collection.
  List | An ordered collection (also known as a sequence).
  Locale | A `Locale` object represents a specific geographical, political, or cultural region.
  Set | A collection that contains no duplicate elements.

- Classes in java.util used by javax.imageio.event
  Class | Description
  --- | ---
  EventListener | A tagging interface that all event listener interfaces must extend.

- Classes in java.util used by javax.imageio.metadata
  Class | Description
  --- | ---
  List | An ordered collection (also known as a sequence).
  Locale | A `Locale` object represents a specific geographical, political, or cultural region.

- Classes in java.util used by javax.imageio.plugins.bmp
  Class | Description
  --- | ---
  Locale | A `Locale` object represents a specific geographical, political, or cultural region.

- Classes in java.util used by javax.imageio.plugins.jpeg
  Class | Description
  --- | ---
  Locale | A `Locale` object represents a specific geographical, political, or cultural region.

- Classes in java.util used by javax.imageio.plugins.tiff
  Class | Description
  --- | ---
  List | An ordered collection (also known as a sequence).
  SortedSet | A `Set` that further provides a total ordering on its elements.

- Classes in java.util used by javax.imageio.spi
  Class | Description
  --- | ---
  Iterator | An iterator over a collection.
  Locale | A `Locale` object represents a specific geographical, political, or cultural region.

- Classes in java.util used by javax.lang.model
  Class | Description
  --- | ---
  List | An ordered collection (also known as a sequence).

- Classes in java.util used by javax.lang.model.element
  Class | Description
  --- | ---
  List | An ordered collection (also known as a sequence).
  Map | An object that maps keys to values.
  Set | A collection that contains no duplicate elements.

- Classes in java.util used by javax.lang.model.type
  Class | Description
  --- | ---
  List | An ordered collection (also known as a sequence).

- Classes in java.util used by javax.lang.model.util
  Class | Description
  --- | ---
  List | An ordered collection (also known as a sequence).
  Map | An object that maps keys to values.
  Set | A collection that contains no duplicate elements.

- Classes in java.util used by javax.management
  Class | Description
  --- | ---
  AbstractCollection | This class provides a skeletal implementation of the `Collection` interface, to minimize the effort required to implement this interface.
  AbstractList | This class provides a skeletal implementation of the `List` interface to minimize the effort required to implement this interface backed by a "random access" data store (such as an array).
  ArrayList | Resizable-array implementation of the `List` interface.
  Collection | The root interface in the collection hierarchy.
  EventListener | A tagging interface that all event listener interfaces must extend.
  EventObject | The root class from which all event state objects shall be derived.
  Hashtable | This class implements a hash table, which maps keys to values.
  List | An ordered collection (also known as a sequence).
  Map | An object that maps keys to values.
  RandomAccess | Marker interface used by `List` implementations to indicate that they support fast (generally constant time) random access.
  Set | A collection that contains no duplicate elements.
  Vector | The `Vector` class implements a growable array of objects.

- Classes in java.util used by javax.management.loading
  Class | Description
  --- | ---
  Enumeration | An object that implements the Enumeration interface generates a series of elements, one at a time.
  List | An ordered collection (also known as a sequence).
  Map | An object that maps keys to values.
  Set | A collection that contains no duplicate elements.

- Classes in java.util used by javax.management.monitor
  Class | Description
  --- | ---
  EventObject | The root class from which all event state objects shall be derived.

- Classes in java.util used by javax.management.openmbean
  Class | Description
  --- | ---
  Collection | The root interface in the collection hierarchy.
  Date | The class `Date` represents a specific instant in time, with millisecond precision.
  List | An ordered collection (also known as a sequence).
  Map | An object that maps keys to values.
  Map.Entry | A map entry (key-value pair).
  Set | A collection that contains no duplicate elements.

- Classes in java.util used by javax.management.relation
  Class | Description
  --- | ---
  AbstractCollection | This class provides a skeletal implementation of the `Collection` interface, to minimize the effort required to implement this interface.
  AbstractList | This class provides a skeletal implementation of the `List` interface to minimize the effort required to implement this interface backed by a "random access" data store (such as an array).
  ArrayList | Resizable-array implementation of the `List` interface.
  Collection | The root interface in the collection hierarchy.
  EventListener | A tagging interface that all event listener interfaces must extend.
  EventObject | The root class from which all event state objects shall be derived.
  List | An ordered collection (also known as a sequence).
  Map | An object that maps keys to values.
  RandomAccess | Marker interface used by `List` implementations to indicate that they support fast (generally constant time) random access.
  Vector | The `Vector` class implements a growable array of objects.

- Classes in java.util used by javax.management.remote
  Class | Description
  --- | ---
  EventObject | The root class from which all event state objects shall be derived.
  Map | An object that maps keys to values.

- Classes in java.util used by javax.management.remote.rmi
  Class | Description
  --- | ---
  Map | An object that maps keys to values.
  Set | A collection that contains no duplicate elements.

- Classes in java.util used by javax.management.timer
  Class | Description
  --- | ---
  Date | The class `Date` represents a specific instant in time, with millisecond precision.
  EventObject | The root class from which all event state objects shall be derived.
  Vector | The `Vector` class implements a growable array of objects.

- Classes in java.util used by javax.naming
  Class | Description
  --- | ---
  Enumeration | An object that implements the Enumeration interface generates a series of elements, one at a time.
  Hashtable | This class implements a hash table, which maps keys to values.
  Properties | The `Properties` class represents a persistent set of properties.
  Vector | The `Vector` class implements a growable array of objects.

- Classes in java.util used by javax.naming.directory
  Class | Description
  --- | ---
  Hashtable | This class implements a hash table, which maps keys to values.
  Vector | The `Vector` class implements a growable array of objects.

- Classes in java.util used by javax.naming.event
  Class | Description
  --- | ---
  EventListener | A tagging interface that all event listener interfaces must extend.
  EventObject | The root class from which all event state objects shall be derived.

- Classes in java.util used by javax.naming.ldap
  Class | Description
  --- | ---
  Enumeration | An object that implements the Enumeration interface generates a series of elements, one at a time.
  EventListener | A tagging interface that all event listener interfaces must extend.
  EventObject | The root class from which all event state objects shall be derived.
  Hashtable | This class implements a hash table, which maps keys to values.
  List | An ordered collection (also known as a sequence).

- Classes in java.util used by javax.naming.ldap.spi
  Class | Description
  --- | ---
  List | An ordered collection (also known as a sequence).
  Map | An object that maps keys to values.
  Optional | A container object which may or may not contain a non-`null` value.

- Classes in java.util used by javax.naming.spi
  Class | Description
  --- | ---
  Hashtable | This class implements a hash table, which maps keys to values.

- Classes in java.util used by javax.net.ssl
  Class | Description
  --- | ---
  Collection | The root interface in the collection hierarchy.
  Enumeration | An object that implements the Enumeration interface generates a series of elements, one at a time.
  EventListener | A tagging interface that all event listener interfaces must extend.
  EventObject | The root class from which all event state objects shall be derived.
  List | An ordered collection (also known as a sequence).
  Optional | A container object which may or may not contain a non-`null` value.

- Classes in java.util used by javax.print.attribute
  Class | Description
  --- | ---
  Date | The class `Date` represents a specific instant in time, with millisecond precision.
  Locale | A `Locale` object represents a specific geographical, political, or cultural region.

- Classes in java.util used by javax.print.attribute.standard
  Class | Description
  --- | ---
  AbstractCollection | This class provides a skeletal implementation of the `Collection` interface, to minimize the effort required to implement this interface.
  AbstractMap | This class provides a skeletal implementation of the `Map` interface, to minimize the effort required to implement this interface.
  AbstractSet | This class provides a skeletal implementation of the `Set` interface to minimize the effort required to implement this interface.
  Collection | The root interface in the collection hierarchy.
  Date | The class `Date` represents a specific instant in time, with millisecond precision.
  HashMap | Hash table based implementation of the `Map` interface.
  HashSet | This class implements the `Set` interface, backed by a hash table (actually a `HashMap` instance).
  Locale | A `Locale` object represents a specific geographical, political, or cultural region.
  Map | An object that maps keys to values.
  Set | A collection that contains no duplicate elements.

- Classes in java.util used by javax.print.event
  Class | Description
  --- | ---
  EventObject | The root class from which all event state objects shall be derived.

- Classes in java.util used by javax.script
  Class | Description
  --- | ---
  List | An ordered collection (also known as a sequence).
  Map | An object that maps keys to values.

- Classes in java.util used by javax.security.auth
  Class | Description
  --- | ---
  Set | A collection that contains no duplicate elements.

- Classes in java.util used by javax.security.auth.callback
  Class | Description
  --- | ---
  Locale | A `Locale` object represents a specific geographical, political, or cultural region.

- Classes in java.util used by javax.security.auth.kerberos
  Class | Description
  --- | ---
  Date | The class `Date` represents a specific instant in time, with millisecond precision.

- Classes in java.util used by javax.security.auth.login
  Class | Description
  --- | ---
  Map | An object that maps keys to values.

- Classes in java.util used by javax.security.auth.spi
  Class | Description
  --- | ---
  Map | An object that maps keys to values.

- Classes in java.util used by javax.security.auth.x500
  Class | Description
  --- | ---
  Map | An object that maps keys to values.

- Classes in java.util used by javax.security.cert
  Class | Description
  --- | ---
  Date | The class `Date` represents a specific instant in time, with millisecond precision.

- Classes in java.util used by javax.security.sasl
  Class | Description
  --- | ---
  Enumeration | An object that implements the Enumeration interface generates a series of elements, one at a time.
  Map | An object that maps keys to values.

- Classes in java.util used by javax.smartcardio
  Class | Description
  --- | ---
  List | An ordered collection (also known as a sequence).

- Classes in java.util used by javax.sound.midi
  Class | Description
  --- | ---
  EventListener | A tagging interface that all event listener interfaces must extend.
  List | An ordered collection (also known as a sequence).
  Map | An object that maps keys to values.
  Vector | The `Vector` class implements a growable array of objects.

- Classes in java.util used by javax.sound.sampled
  Class | Description
  --- | ---
  EventListener | A tagging interface that all event listener interfaces must extend.
  EventObject | The root class from which all event state objects shall be derived.
  Map | An object that maps keys to values.

- Classes in java.util used by javax.sql
  Class | Description
  --- | ---
  Calendar | The `Calendar` class is an abstract class that provides methods for converting between a specific instant in time and a set of `calendar fields` such as `YEAR`, `MONTH`, `DAY_OF_MONTH`, `HOUR`, and so on, and for manipulating the calendar fields, such as getting the date of the next week.
  EventListener | A tagging interface that all event listener interfaces must extend.
  EventObject | The root class from which all event state objects shall be derived.
  Map | An object that maps keys to values.

- Classes in java.util used by javax.sql.rowset
  Class | Description
  --- | ---
  Calendar | The `Calendar` class is an abstract class that provides methods for converting between a specific instant in time and a set of `calendar fields` such as `YEAR`, `MONTH`, `DAY_OF_MONTH`, `HOUR`, and so on, and for manipulating the calendar fields, such as getting the date of the next week.
  Collection | The root interface in the collection hierarchy.
  Map | An object that maps keys to values.

- Classes in java.util used by javax.sql.rowset.serial
  Class | Description
  --- | ---
  Map | An object that maps keys to values.
  Vector | The `Vector` class implements a growable array of objects.

- Classes in java.util used by javax.sql.rowset.spi
  Class | Description
  --- | ---
  Enumeration | An object that implements the Enumeration interface generates a series of elements, one at a time.

- Classes in java.util used by javax.swing
  Class | Description
  --- | ---
  Collection | The root interface in the collection hierarchy.
  Comparator | A comparison function, which imposes a total ordering on some collection of objects.
  Date | The class `Date` represents a specific instant in time, with millisecond precision.
  Dictionary | The `Dictionary` class is the abstract parent of any class, such as `Hashtable`, which maps keys to values.
  Enumeration | An object that implements the Enumeration interface generates a series of elements, one at a time.
  EventListener | A tagging interface that all event listener interfaces must extend.
  EventObject | The root class from which all event state objects shall be derived.
  Hashtable | This class implements a hash table, which maps keys to values.
  List | An ordered collection (also known as a sequence).
  Locale | A `Locale` object represents a specific geographical, political, or cultural region.
  Map | An object that maps keys to values.
  Set | A collection that contains no duplicate elements.
  Vector | The `Vector` class implements a growable array of objects.

- Classes in java.util used by javax.swing.event
  Class | Description
  --- | ---
  EventListener | A tagging interface that all event listener interfaces must extend.
  EventObject | The root class from which all event state objects shall be derived.

- Classes in java.util used by javax.swing.plaf.basic
  Class | Description
  --- | ---
  EventListener | A tagging interface that all event listener interfaces must extend.
  Hashtable | This class implements a hash table, which maps keys to values.
  Vector | The `Vector` class implements a growable array of objects.

- Classes in java.util used by javax.swing.plaf.metal
  Class | Description
  --- | ---
  EventListener | A tagging interface that all event listener interfaces must extend.

- Classes in java.util used by javax.swing.plaf.multi
  Class | Description
  --- | ---
  Vector | The `Vector` class implements a growable array of objects.

- Classes in java.util used by javax.swing.plaf.synth
  Class | Description
  --- | ---
  EventListener | A tagging interface that all event listener interfaces must extend.

- Classes in java.util used by javax.swing.table
  Class | Description
  --- | ---
  Comparator | A comparison function, which imposes a total ordering on some collection of objects.
  Enumeration | An object that implements the Enumeration interface generates a series of elements, one at a time.
  EventListener | A tagging interface that all event listener interfaces must extend.
  Vector | The `Vector` class implements a growable array of objects.

- Classes in java.util used by javax.swing.text
  Class | Description
  --- | ---
  Dictionary | The `Dictionary` class is the abstract parent of any class, such as `Hashtable`, which maps keys to values.
  Enumeration | An object that implements the Enumeration interface generates a series of elements, one at a time.
  EventListener | A tagging interface that all event listener interfaces must extend.
  Vector | The `Vector` class implements a growable array of objects.

- Classes in java.util used by javax.swing.text.html
  Class | Description
  --- | ---
  Enumeration | An object that implements the Enumeration interface generates a series of elements, one at a time.
  EventListener | A tagging interface that all event listener interfaces must extend.
  EventObject | The root class from which all event state objects shall be derived.
  Vector | The `Vector` class implements a growable array of objects.

- Classes in java.util used by javax.swing.text.html.parser
  Class | Description
  --- | ---
  BitSet | This class implements a vector of bits that grows as needed.
  Enumeration | An object that implements the Enumeration interface generates a series of elements, one at a time.
  Hashtable | This class implements a hash table, which maps keys to values.
  Vector | The `Vector` class implements a growable array of objects.

- Classes in java.util used by javax.swing.tree
  Class | Description
  --- | ---
  Enumeration | An object that implements the Enumeration interface generates a series of elements, one at a time.
  EventListener | A tagging interface that all event listener interfaces must extend.
  EventObject | The root class from which all event state objects shall be derived.
  Vector | The `Vector` class implements a growable array of objects.

- Classes in java.util used by javax.swing.undo
  Class | Description
  --- | ---
  EventListener | A tagging interface that all event listener interfaces must extend.
  Hashtable | This class implements a hash table, which maps keys to values.
  Vector | The `Vector` class implements a growable array of objects.

- Classes in java.util used by javax.tools
  Class | Description
  --- | ---
  Collection | The root interface in the collection hierarchy.
  Iterator | An iterator over a collection.
  List | An ordered collection (also known as a sequence).
  Locale | A `Locale` object represents a specific geographical, political, or cultural region.
  ServiceLoader | A facility to load implementations of a service.
  Set | A collection that contains no duplicate elements.

- Classes in java.util used by javax.xml.crypto
  Class | Description
  --- | ---
  Iterator | An iterator over a collection.

- Classes in java.util used by javax.xml.crypto.dom
  Class | Description
  --- | ---
  Iterator | An iterator over a collection.
  Map.Entry | A map entry (key-value pair).

- Classes in java.util used by javax.xml.crypto.dsig
  Class | Description
  --- | ---
  List | An ordered collection (also known as a sequence).

- Classes in java.util used by javax.xml.crypto.dsig.keyinfo
  Class | Description
  --- | ---
  List | An ordered collection (also known as a sequence).

- Classes in java.util used by javax.xml.crypto.dsig.spec
  Class | Description
  --- | ---
  List | An ordered collection (also known as a sequence).
  Map | An object that maps keys to values.

- Classes in java.util used by javax.xml.datatype
  Class | Description
  --- | ---
  Calendar | The `Calendar` class is an abstract class that provides methods for converting between a specific instant in time and a set of `calendar fields` such as `YEAR`, `MONTH`, `DAY_OF_MONTH`, `HOUR`, and so on, and for manipulating the calendar fields, such as getting the date of the next week.
  Date | The class `Date` represents a specific instant in time, with millisecond precision.
  GregorianCalendar | `GregorianCalendar` is a concrete subclass of `Calendar` and provides the standard calendar system used by most of the world.
  Locale | A `Locale` object represents a specific geographical, political, or cultural region.
  TimeZone | `TimeZone` represents a time zone offset, and also figures out daylight savings.

- Classes in java.util used by javax.xml.namespace
  Class | Description
  --- | ---
  Iterator | An iterator over a collection.

- Classes in java.util used by javax.xml.stream
  Class | Description
  --- | ---
  Iterator | An iterator over a collection.

- Classes in java.util used by javax.xml.stream.events
  Class | Description
  --- | ---
  Iterator | An iterator over a collection.
  List | An ordered collection (also known as a sequence).

- Classes in java.util used by javax.xml.stream.util
  Class | Description
  --- | ---
  Iterator | An iterator over a collection.

- Classes in java.util used by javax.xml.transform
  Class | Description
  --- | ---
  Properties | The `Properties` class represents a persistent set of properties.

- Classes in java.util used by javax.xml.xpath
  Class | Description
  --- | ---
  Iterator | An iterator over a collection.
  List | An ordered collection (also known as a sequence).

- Classes in java.util used by jdk.dynalink
  Class | Description
  --- | ---
  List | An ordered collection (also known as a sequence).
  ServiceConfigurationError | Error thrown when something goes wrong while locating, loading, or instantiating a service provider.

- Classes in java.util used by jdk.dynalink.beans
  Class | Description
  --- | ---
  Set | A collection that contains no duplicate elements.

- Classes in java.util used by jdk.dynalink.linker
  Class | Description
  --- | ---
  List | An ordered collection (also known as a sequence).

- Classes in java.util used by jdk.dynalink.linker.support
  Class | Description
  --- | ---
  List | An ordered collection (also known as a sequence).

- Classes in java.util used by jdk.javadoc.doclet
  Class | Description
  --- | ---
  List | An ordered collection (also known as a sequence).
  Locale | A `Locale` object represents a specific geographical, political, or cultural region.
  Set | A collection that contains no duplicate elements.

- Classes in java.util used by jdk.jfr
  Class | Description
  --- | ---
  List | An ordered collection (also known as a sequence).
  Map | An object that maps keys to values.
  Set | A collection that contains no duplicate elements.

- Classes in java.util used by jdk.jfr.consumer
  Class | Description
  --- | ---
  List | An ordered collection (also known as a sequence).

- Classes in java.util used by jdk.jshell
  Class | Description
  --- | ---
  Collection | The root interface in the collection hierarchy.
  List | An ordered collection (also known as a sequence).
  Locale | A `Locale` object represents a specific geographical, political, or cultural region.
  Map | An object that maps keys to values.

- Classes in java.util used by jdk.jshell.execution
  Class | Description
  --- | ---
  List | An ordered collection (also known as a sequence).
  Map | An object that maps keys to values.

- Classes in java.util used by jdk.jshell.spi
  Class | Description
  --- | ---
  List | An ordered collection (also known as a sequence).
  Map | An object that maps keys to values.

- Classes in java.util used by jdk.jshell.tool
  Class | Description
  --- | ---
  Locale | A `Locale` object represents a specific geographical, political, or cultural region.
  Map | An object that maps keys to values.

- Classes in java.util used by jdk.management.jfr
  Class | Description
  --- | ---
  List | An ordered collection (also known as a sequence).
  Map | An object that maps keys to values.

- Classes in java.util used by jdk.nashorn.api.scripting
  Class | Description
  --- | ---
  Collection | The root interface in the collection hierarchy.
  Map | An object that maps keys to values.
  Set | A collection that contains no duplicate elements.

- Classes in java.util used by jdk.nashorn.api.tree
  Class | Description
  --- | ---
  List | An ordered collection (also known as a sequence).

- Classes in java.util used by jdk.net
  Class | Description
  --- | ---
  Set | A collection that contains no duplicate elements.

- Classes in java.util used by org.xml.sax
  Class | Description
  --- | ---
  Locale | A `Locale` object represents a specific geographical, political, or cultural region.

- Classes in java.util used by org.xml.sax.helpers
  Class | Description
  --- | ---
  Enumeration | An object that implements the Enumeration interface generates a series of elements, one at a time.
  Locale | A `Locale` object represents a specific geographical, political, or cultural region.