Java Programming by Pearson

254 • Java Programming

To make use of an interface, it has to be inherited by some class. An interface can also inherit the

interface for extending purpose. For inheriting an interface, either to a class or an interface, ‘implements’

keyword is used. Look at the example below.

class usedemo implements demo

{

public void fun()

{

System.out.println("Hello from fun");

}

}

All methods of interfaces when implementing in the class must be declared public otherwise, it may

result in compilation error.

Some other class might provide different implementation of method fun as given below.

class temp implements demo

{

public void fun() ...