package code; class Animal{ private void beat(){ System.out.println("my heart is beating!"); } public void breath(){ System.out.println("I'm breathing!"); } public void show(){ beat(); breath(); } } class Bird extends Animal{ public void fly(){ System.out.println("I'm flying!"); } } class Wolf extends Animal{ public void run(){ System.out.println("I'm running!"); } } public class ExtendsTest{ public static void main(String[] args){ Bird bird = new Bird(); bird.show(); bird.fly(); Wolf wolf = new Wolf(); wolf.show(); wolf.run(); } }