Package Summary Overview Summary

### class:System.Logger [NONE]
Enclosing class: `System` public static interface System.Logger `System.Logger` instances log messages that will be routed to the underlying logging framework the `LoggerFinder` uses. `System.Logger` instances are typically obtained from the `System` class, by calling `System.getLogger(loggerName)` or `System.getLogger(loggerName, bundle)` . Since: 9 See Also: `System.getLogger(java.lang.String)` `System.getLogger(java.lang.String, java.util.ResourceBundle)` `System.LoggerFinder`

### method:getName() [NONE]
### getName String getName() Returns the name of this logger. Returns: the logger name.

### method:isLoggable(java.lang.System.Logger.Level) [NONE]
### isLoggable boolean isLoggable (System.Logger.Level level) Checks if a message of the given level would be logged by this logger. Parameters: `level` - the log message level. Returns: `true` if the given log message level is currently being logged. Throws: `NullPointerException` - if `level` is `null`.

### method:log(java.lang.System.Logger.Level,java.lang.String) [NONE]
### log default void log (System.Logger.Level level, String msg) Logs a message. Implementation Requirements: The default implementation for this method calls `this.log(level, (ResourceBundle)null, msg, (Object[])null);` Parameters: `level` - the log message level. `msg` - the string message (or a key in the message catalog, if this logger is a `localized logger` ); can be `null`. Throws: `NullPointerException` - if `level` is `null`.

### method:log(java.lang.System.Logger.Level,java.util.function.Supplier) [NONE]
### log default void log (System.Logger.Level level, Supplier<String> msgSupplier) Logs a lazily supplied message. If the logger is currently enabled for the given log message level then a message is logged that is the result produced by the given supplier function. Otherwise, the supplier is not operated on. Implementation Requirements: When logging is enabled for the given level, the default implementation for this method calls `this.log(level, (ResourceBundle)null, msgSupplier.get(), (Object[])null);` Parameters: `level` - the log message level. `msgSupplier` - a supplier function that produces a message. Throws: `NullPointerException` - if `level` is `null`, or `msgSupplier` is `null`.

### method:log(java.lang.System.Logger.Level,java.lang.Object) [NONE]
### log default void log (System.Logger.Level level, Object obj) Logs a message produced from the given object. If the logger is currently enabled for the given log message level then a message is logged that, by default, is the result produced from calling toString on the given object. Otherwise, the object is not operated on. Implementation Requirements: When logging is enabled for the given level, the default implementation for this method calls `this.log(level, (ResourceBundle)null, obj.toString(), (Object[])null);` Parameters: `level` - the log message level. `obj` - the object to log. Throws: `NullPointerException` - if `level` is `null`, or `obj` is `null`.

### method:log(java.lang.System.Logger.Level,java.lang.String,java.lang.Throwable) [NONE]
### log default void log (System.Logger.Level level, String msg, Throwable thrown) Logs a message associated with a given throwable. Implementation Requirements: The default implementation for this method calls `this.log(level, (ResourceBundle)null, msg, thrown);` Parameters: `level` - the log message level. `msg` - the string message (or a key in the message catalog, if this logger is a `localized logger` ); can be `null`. `thrown` - a `Throwable` associated with the log message; can be `null`. Throws: `NullPointerException` - if `level` is `null`.

### method:log(java.lang.System.Logger.Level,java.util.function.Supplier,java.lang.Throwable) [NONE]
### log default void log (System.Logger.Level level, Supplier<String> msgSupplier, Throwable thrown) Logs a lazily supplied message associated with a given throwable. If the logger is currently enabled for the given log message level then a message is logged that is the result produced by the given supplier function. Otherwise, the supplier is not operated on. Implementation Requirements: When logging is enabled for the given level, the default implementation for this method calls `this.log(level, (ResourceBundle)null, msgSupplier.get(), thrown);` Parameters: `level` - one of the log message level identifiers. `msgSupplier` - a supplier function that produces a message. `thrown` - a `Throwable` associated with log message; can be `null`. Throws: `NullPointerException` - if `level` is `null`, or `msgSupplier` is `null`.

### method:log(java.lang.System.Logger.Level,java.lang.String,java.lang.Object...) [NONE]
### log default void log (System.Logger.Level level, String format, Object... params) Logs a message with an optional list of parameters. Implementation Requirements: The default implementation for this method calls `this.log(level, (ResourceBundle)null, format, params);` Parameters: `level` - one of the log message level identifiers. `format` - the string message format in `MessageFormat` format, (or a key in the message catalog, if this logger is a `localized logger` ); can be `null`. `params` - an optional list of parameters to the message (may be none). Throws: `NullPointerException` - if `level` is `null`.

### method:log(java.lang.System.Logger.Level,java.util.ResourceBundle,java.lang.String,java.lang.Throwable) [NONE]
### log void log (System.Logger.Level level, ResourceBundle bundle, String msg, Throwable thrown) Logs a localized message associated with a given throwable. If the given resource bundle is non-`null`, the `msg` string is localized using the given resource bundle. Otherwise the `msg` string is not localized. Parameters: `level` - the log message level. `bundle` - a resource bundle to localize `msg`; can be `null`. `msg` - the string message (or a key in the message catalog, if `bundle` is not `null`); can be `null`. `thrown` - a `Throwable` associated with the log message; can be `null`. Throws: `NullPointerException` - if `level` is `null`.

### method:log(java.lang.System.Logger.Level,java.util.ResourceBundle,java.lang.String,java.lang.Object...) [NONE]
### log void log (System.Logger.Level level, ResourceBundle bundle, String format, Object... params) Logs a message with resource bundle and an optional list of parameters. If the given resource bundle is non-`null`, the `format` string is localized using the given resource bundle. Otherwise the `format` string is not localized. Parameters: `level` - the log message level. `bundle` - a resource bundle to localize `format`; can be `null`. `format` - the string message format in `MessageFormat` format, (or a key in the message catalog if `bundle` is not `null`); can be `null`. `params` - an optional list of parameters to the message (may be none). Throws: `NullPointerException` - if `level` is `null`.