抽象类的应用模版设计

abstract class Action {
	//1对行为进行抽象
	public static final int EAT = 1;
	public static final int SLEEP = 5;
	public static final int WORK = 7;

	//3行为类控制子类的操作
	public void command(int flag) {
		switch (flag) {
			case EAT: {
				this.eat();
				break;
			}
			case SLEEP: {
				this.sleep();
				break;
			}
			case WORK: {
				this.work();
				break;
			}
		
		}
	}

	 public abstract void eat();
	 public abstract void sleep();
	 public abstract void work();
}

//2定义行为类下面的具体子类
class Robot extends Action {
	public void eat() {
		System.out.println("机器人充电");
	}
	public void sleep() {
	
	}
	public void work() {
		System.out.println("机器人工作");
		}
}
class Human extends Action {
	public void eat() {
		System.out.println("人吃饭");
	}
	public void sleep() {
		System.out.println("人睡觉");
	
	}
	public void work() {
		System.out.println("人工作");
		}
}
class Pig extends Action {
	public void eat() {
		System.out.println("猪吃饭");
	}
	public void sleep() {
		System.out.println("猪睡觉");
	
	}
	public void work() {
		
		}
}

public class TestDemo {
	public static void main(String[] args) {
		fun(new Robot());
		fun(new Human());
		fun(new Pig());
	}
	public static void fun(Action action) {
		action.command(Action.EAT);
		action.command(Action.SLEEP);
		action.command(Action.WORK);
	}
}