Interface in Java, #JAVA #javaprogramming

In Java, an interface is a reference type, similar to a class, that can contain only:
- Abstract methods (implicitly public and abstract)
- Default methods (with a body, using default)
- Static methods
- Constant fields (public static final)

Purpose of Interfaces
- Define a contract that implementing classes must follow.
- Support multiple inheritance (Java doesn't allow multiple class inheritance, but a class can implement multiple interfaces).
- Enable polymorphism and abstraction.

AFTER JAVA 8, methods in interface can have definition

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