继承—people

 1 public class People {
 2
 3     private double height;//身高
 4     private double weight;//体重
 5
 6     public double getHeight() {
 7         return height;
 8     }
 9
10     public void setHeight(double height) {
11         this.height = height;
12     }
13
14     public double getWeight() {
15         return weight;
16     }
17
18     public void setWeight(double weight) {
19         this.weight = weight;
20     }
21
22
23     //方法打招呼
24     public void speakHello(){
25         System.out.println("hello ！");
26     }

 1 //extends  继承
 2 public class ChinaPeople extends People {
 3
 4     public void ChinaKongFu(){
 5         System.out.println("坐如钟，站如松。");
 6     }
 7     //重写   覆盖
 8     public void speakHello(){
 9         System.out.println("你好！");
10     }
11 }

1 public class AmericanPeople extends People {
2
3     public void americanBoxing(){
4         System.out.println("直拳，左勾拳");
5     }
6 }

 1 public class Text_People {
 2
 3     public static void main(String[] args) {
 4         People p1 = new People();
 5         p1.speakHello();
 6
 7         ChinaPeople p2 = new ChinaPeople();
 8         p2.speakHello();
 9         p2.ChinaKongFu();
10
11
12
13     }
14 }

运行：