继承—people

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();
        
        
        
    }
}

运行：