inheritance in interfaces

 package com.company;

interface sampleInterface{
    void meth1();
    void meth2();
}
interface childSampleInterface extends sampleInterface{
    void meth3();
    void meth4();
}
class MySample implements childSampleInterface{
    public void meth1(){
        System.out.println(1);
    }
   public void meth2(){
        System.out.println(2);
    }
   public void meth3(){
        System.out.println(3);
    }
   public void meth4(){
        System.out.println(4);
    }
}
public class CWH_58_inheritance_interface {
    public static void main(String[] args) {    
MySample obj=new MySample();
obj.meth1();
obj.meth2();
obj.meth3();
obj.meth4();
    }
}