课堂回顾:重载和继承

重载:

 1 package org.hanqi.pn0120;
 2 
 3 public class Jisuanqi {
 4     
 5     //整型加法
 6     public int add(int a,int b)
 7     {
 8         return a+b;
 9     }
10     //重载      参数个数不同
11     public double add(int c, int d,int e)
12     {
13         return c+d+e;
14     }
15     
16     
17     //浮点型加法      方法的重载(多态的一种体现)
18     //参数类型不同
19     public double add(double a,double b)
20     {
21         return a+b;
22     }
23 
24     public static void main(String[] args) {
25         // TODO Auto-generated method stub
26         Jisuanqi j=new Jisuanqi();
27         System.out.println("20+50="+j.add(20, 50));
28         System.out.println("20.12+50.45="+j.add(20.12, 50.45));
29     }
30 
31 }
View Code

继承:

Father类代码:

 1 package org.hanqi.pn0120;
 2 
 3 public class Father {
 4 
 5     private String name;
 6     private int age;
 7     public String getName() {
 8         return name;
 9     }
10     public void setName(String name) {
11         this.name = name;
12     }
13     public int getAge() {
14         return age;
15     }
16     public void setAge(int age) {
17         this.age = age;
18     }
19     
20     public Father()
21     {
22         System.out.println("父类的构造方法");
23     }
24     
25     //工作
26     public void work()
27     {
28         System.out.println("我劳动我光荣");
29     }
30 }
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Son类代码:

 1 package org.hanqi.pn0120;
 2 
 3 public class Son extends Father {
 4     //Object a;  所有类的父类
 5     public Son()
 6     {
 7         System.out.println("子类的构造方法");
 8     }
 9     public void sing()
10     {
11         System.out.println("我喜欢唱歌");
12     }
13     //覆盖(重写)
14     public void work()
15     {
16         System.out.println("我不喜欢上班,我要去参加海选");
17     }
18 }
View Code

Test类代码:

 1 package org.hanqi.pn0120;
 2 
 3 public class Testjicheng {
 4 
 5     public static void main(String[] args) {
 6         // TODO Auto-generated method stub
 7 
 8         Father f=new Father();
 9         f.setName("父亲");
10         f.setAge(50);
11         System.out.println("名字是:"+f.getName()+" 年龄是:"+f.getAge());
12         f.work();
13         System.out.println();
14         Son s=new Son();
15         s.setName("儿子");
16         s.setAge(20);
17         System.out.println("名字是:"+s.getName()+" 年龄是:"+s.getAge());
18         s.work();
19         s.sing();
20     }
21 
22 }
View Code

posted on 2016-03-07 18:48  beens  阅读(143)  评论(0编辑  收藏  举报

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