abstract class Action{    // 定义一个行为类
    public static final String WORK = "work";
    public static final String SLEEP = "sleep";
    public static final String EAT = "eat";
    public abstract void eat();
    public abstract void sleep();
    public abstract void work();
    public void command(String str){
        switch(str){
            case "work":
                this.work();
                break;
            case "sleep":
                this.sleep();
                break;
            case "eat":
                this.eat();
                break;
        }
    }
}
class People extends Action{
    public void sleep(){
        System.out.println("人正在睡觉");
    }
    public void eat(){
        System.out.println("人正在吃饭");
    }
    public void work(){
        System.out.println("人正在工作");
    }
}
class Pig extends Action{
    public void sleep(){
        System.out.println("猪正在睡觉");
    }
    public void eat(){
        System.out.println("猪正在吃饭");
    }
    public void work(){
        
    }
}
class Robot extends Action{
    public void sleep(){
        
    }
    public void eat(){
        System.out.println("机器人正在补充能量");
    }
    public void work(){
        System.out.println("机器人正在工作");
    }
}

public class Test{
    public static void main(String args[]){
         fun(new People());
         fun(new Robot());
    }
    public static void fun(Action act){
        act.command(act.WORK);
        act.command(act.SLEEP);
        act.command(act.EAT);
    }
}