/** * 测试类 * @author thinkpad * */public class AnimalTest { public static void main(String[] args) { Fish fish = new Fish(); fish.breath(); fish.eat(); Cat cat = new Cat(); cat.breath(); cat.eat(); }}/** * Animal类 * @author thinkpad * */class Animal { public void eat() { System.out.println(this.getClass().getSimpleName() + " is eating something."); } public void breath() { System.out.println(this.getClass().getSimpleName() + " is breathing."); }}/** * Fish类 * @author thinkpad * */class Fish extends Animal { }/** * cat类 * @author thinkpad * */class Cat extends Animal { }