继承和组合
共同点：都可以实现代码的复用不同点：
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");
}
}
