JavaSE-10.2.7【Java中继承的注意事项】 

 1 package day1.yppah02;
 2 
 3 /*
 4 2.8. Java中继承的注意事项
 5 
 6     1. Java中类只支持单继承，不支持多继承
 7         错误范例：class A extends B, C { }
 8     2. Java中类支持多层继承
 9         正确范例：calss B extends A { }
10                   calss C extends B { }
11  */
12 
13 /*public class Son extends Father, Mother{ //error
14 
15 }*/
16 
17 public class Son extends Father{
18 
19 }
1 package day1.yppah02;
2 
3 public class Mother {
4 
5     public void dance(){
6         System.out.println("妈妈爱跳舞");
7     }
8 
9 }
1 package day1.yppah02;
2 
3 public class Father extends Granddad{
4 
5     public void smoke(){
6         System.out.println("爸爸爱抽烟");
7     }
8 
9 }
1 package day1.yppah02;
2 
3 public class Granddad {
4 
5     public void drink(){
6         System.out.println("爷爷爱喝酒");
7     }
8 
9 }

 

posted @ 2021-05-27 20:23  yub4by  阅读(68)  评论(0)    收藏  举报