Inf1.java

class TestDemo{
 public static void main(String[] args) {
 Inf2 obj2 = new Demo();
 obj2.method1();
 obj2.method2();
 }
}

interface Inf1 {
 public void method1();
}

interface Inf2 extends Inf1 {
 public void method2();
}

class Demo implements Inf2 {
 public void method1() {
 System.out.println("Method1");
 };
 public void method2() {
 System.out.println("Method2");
 }
}