Java Inheritance I.java

/* *
* Author: Pavith Bambaravanage
* URL: https://github.com/Pavith19
* */

/*JAVA-7*/

import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

class Animal{
    void walk(){
        System.out.println("I am walking");
    }
}

class Bird extends Animal implements intf{
    void fly(){
        System.out.println("I am flying");
    }
    @Override
    public void sing(){
        System.out.println("I am singing");
    }
}

interface intf{
    void sing();
}

public class Solution{

    public static void main(String args[]){

        Bird bird = new Bird();
        bird.walk();
        bird.fly();
        bird.sing();

    }
}