Interface Concept In java

INTERFACE

• A Java interface is a bit like a class, except a Java interface can only contain method signatures and fields
• An Java interface cannot contain an implementation of the methods, only the signature (name, parameters and exceptions) of the method.
• You can use interfaces in Java as a way to achieve polymorphism.

For Exa.

public interface MyInterface {

    public String hello = "Hello";   //parameter
 
    public void sayHello();          // method signature
}