public class People {

     private double height;//身高

     private double weight;//体重

     public double getHeight() {

         return height;

     }

     public void setHeight(double height) {

         this.height = height;

     }

     public double getWeight() {

         return weight;

     }

     public void setWeight(double weight) {

         this.weight = weight;

     }

     //方法打招呼

     public void speakHello(){

         System.out.println("hello ！");

     }

 //extends  继承

 public class ChinaPeople extends People {

     public void ChinaKongFu(){

         System.out.println("坐如钟，站如松。");

     }

     //重写   覆盖

     public void speakHello(){

         System.out.println("你好！");

     }

 }

 public class AmericanPeople extends People {

     public void americanBoxing(){

         System.out.println("直拳，左勾拳");

     }

 }

 public class Text_People {

     public static void main(String[] args) {

         People p1 = new People();

         p1.speakHello();

         ChinaPeople p2 = new ChinaPeople();

         p2.speakHello();

         p2.ChinaKongFu();

     }

 }