Java Interface example

public class First {

public static void main(String[] args) {
// TODO Auto-generated method stub
Third obj = new Second();
Four obj1 = new Second();
obj.F();
obj.S();
obj1.F();
obj1.M();
obj1.S();
obj1.T();
}

}

public class Second implements Four {

public void F(){

System.out.println("F");

}

public void S(){

System.out.println("S");

}

public void T(){

System.out.println("T");

}

public void M(){

System.out.println("M");

}

}

public interface Third {

void F();

void S();

}

interface Four extends Third{

void T();

void M();

}

output:-

F

S

F

M

S

T