class American extends People

import java.util.*;
public class People {
    //完成 main 方法
    public static void main(String[] args) {
        
        People chinese=new Chinese();
        chinese.speak();
        People american=new American();
        american.speak();        
    }   
    
    protected void speak()
    {
        System.out.println("People Speak");
    }
}

class American extends People
{
    public void speak()
    {
        System.out.println("I am American!");
    }
}

class Chinese extends People
{
    public void speak()
    {
        System.out.println("我是中国人！");
    }
}

---------- java ----------
我是中国人！
I am American!

Output completed (0 sec consumed) - Normal Termination