42_面向对象_15_继承_组合

继承和组合

is-a关系：使用继承
has-a关系：使用组合

/**
* 测试组合
* @author
*
*/
public class Animal2 {
String eye;
public void run(){
System.out.println("跑跑！");
}
public void eat(){
System.out.println("吃吃！");
}
public void sleep(){
System.out.println("zzzzz");
}
public  Animal2(){
super();
System.out.println("创建一个动物！");
}
public static void main(String[] args) {
Bird2 b = new Bird2();
b.run();
b.animal2.eat();
}
}

class Mammal2  {
Animal2 animal2=new Animal2();
public void taisheng(){
System.out.println("我是胎生");
}
}

class Bird2  {
Animal2 animal2=new Animal2();
public void run(){
animal2.run();
System.out.println("我是一个小小小小鸟，飞呀飞不高");
}
public void eggSheng(){
System.out.println("卵生");
}
public Bird2(){
super();
System.out.println("建一个鸟对象");
}
}