Java 9 new features | Private methods in interface in java | Java Beam

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In Java SE 7 or earlier versions, an interface can have only two things i.e. Constant variables(public static final) and Abstract methods(public abstract).
Interface methods MUST be implemented by classes which choose to implement the interface. So that 100% concrete class provides the implementation for all the abstract methods in a interface.
Java 8 :
New features to interface were introduced in Java 8 i.e. Default methods and Static methods feature. In Java 8, an interface can have only four types:
Constant variables
Abstract methods
Default methods
Static methods

Java 9 introduced private methods. Private methods can be a static or instance method in interfaces.
In Java 9 and later versions, an interface can have six different things:
Constant variables
Abstract methods
Default methods
Static methods
Private methods
Private Static methods
These private methods will improve code re-usability inside interfaces and will provide choice to expose only our intended methods implementations to out side world.
These methods are only accessible within that interface only and cannot be accessed or inherited from an interface to another interface or class




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