JAVA9 new Features--syntax improvements: private methods for interfaces

1. Official feature

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Support for private methods in interfaces is briefly in consideration for inclusion in Java SE 8 as part of the effort to add support for Lambda Expressions, but is withdrawn to enable better focus on higher priority tasks for Java S E 8. It's now proposed, that support for private interface methods be undertaken thereby enabling non abstract methods of a in Terface to share code between them.

2. Instructions for use

The methods in the specified interface in Java 8 can define static methods and default methods in addition to abstract methods. To some extent, the functionality of the interface is extended, and the interface is more like an abstract class at this point.

In Java 9, the interface is more flexible and powerful, and even the access modifiers of the method can be declared as private, and the method will not be part of the API you expose.

3. Examples of Use

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JAVA9 new Features--syntax improvements: private methods for interfaces