創建如下三個類：（People類中的三個方法分別輸出一些信息，ChinaPeople 和AmericanPeople類重寫父類的三個方法）。

package zhongqiuzuoye;

public class People {
    protected double height;
    protected double weight;
    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;
    }
    
    public void speakHello()
    {
    }
    public void averageHeight()
    {
    }
    public void averageWeight()
    {        
    }

}

package zhongqiuzuoye;

public class ChinaPeople extends People{
    public void chinaGoufu()
    {
        System.out.println("坐如鍾，站如松");
    }
    public void speakHello()
    {
        System.out.println("你好");
    }
    public void averageHeight()
    {
        System.out.println("中國人平均身高為170cm");
    }
    public void averageWeight()
    {
        System.out.println("中國人平均體重是70kg");
    }

    

}

package zhongqiuzuoye;

public class AmericnPeople extends People{
    public void chinaGoufu()
    {
        System.out.println("直拳");
    }    
    public void speakHello()
    {
        System.out.println("hello");
    }
    public void averageHeight()
    {
        System.out.println("美國人平均身高為180cm");
    }
    public void averageWeight()
    {
        System.out.println("美國人平均體重是80kg");
    }

}

package zhongqiuzuoye;

public class TestPeople {
    
    public static void main(String[] args) {
        
        ChinaPeople c =new ChinaPeople();
        c.speakHello();
        c.averageHeight();
        c.averageWeight();
        
        AmericnPeople a=new AmericnPeople();
        a.speakHello();
        a.averageHeight();
        a.averageWeight();


}
}