模板设计模式（Template ）

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);    }}