Summary

A new method isEmpty which would return true if the corresponding Optional does not have a value. Else, it would return false. The proposed method is to be added in Optional, OptionalInt, OptionalDouble and OptionalLong classes.

Problem

A method isPresent is available now in Optional, OptionalInt, OptionalDouble and OptionalLong classes. It would be helpful to have its inverse Optional.isEmpty as well.

Solution

A new method isEmpty in Optional, OptionalInt, OptionalLong and OptionalDouble classes.

Specification

<pre> /src/java.base/share/classes/java/util/Optional.java /** + * If a value is not present, returns {@code true}, otherwise + * {@code false}. + * + * @return {@code true} if a value is not present, otherwise {@code false} + * @since 11 + */ + public boolean isEmpty() { /src/java.base/share/classes/java/util/OptionalDouble.java /** + * If a value is not present, returns {@code true}, otherwise + * {@code false}. + * + * @return {@code true} if a value is not present, otherwise {@code false} + * @since 11 + */ + public boolean isEmpty() { /src/java.base/share/classes/java/util/OptionalInt.java /** + * If a value is not present, returns {@code true}, otherwise + * {@code false}. + * + * @return {@code true} if a value is not present, otherwise {@code false} + * @since 11 + */ + public boolean isEmpty() { /src/java.base/share/classes/java/util/OptionalLong.java /** + * If a value is not present, returns {@code true}, otherwise + * {@code false}. + * + * @return {@code true} if a value is not present, otherwise {@code false} + * @since 11 + */ + public boolean isEmpty() { </pre>