IfExtend.java

package chapter9;

//One interface can extend another
interface A2 {
    void meth1();

    void meth2();
}

//B2 now includes meth1() and meth2() -- it adds meth3();
interface B2 extends A2 {
    void meth3();
}

//This class must implement all of A2 and B2
class MyClass implements B2 {

    public void meth1() {
        System.out.println("Implement meth1()");
    }

    public void meth2() {
        System.out.println("Implement meth2()");

    }

    public void meth3() {
        System.out.println("Implement meth3()");

    }
}

public class IfExtend {
    public static void main(String[] args) {
        MyClass ob = new MyClass();
        ob.meth1();
        ob.meth2();
        ob.meth3();
    }
}