GOF23之状态模式

2019独角兽企业重金招聘Python工程师标准>>>

 

 

package com.gof.state;

public interface State {
	void  handle();
}

package com.gof.state;

/**
 * 空闲状态
 * @author root
 *
 */
public class FreeState implements State {

	@Override
	public void handle() {
		System.out.println("空闲状态，没人住");
	}

}

package com.gof.state;

/**
 * 预定状态
 * @author root
 *
 */
public class BookedState implements State {

	@Override
	public void handle() {
		System.out.println("房间以预定，别人不能定");
	}

}

package com.gof.state;

/**
 * 入住状态
 * @author root
 *
 */
public class CheckInState implements State {

	@Override
	public void handle() {
		System.out.println("房间已经入住，请勿打扰");
	}

}

package com.gof.state;

public class Context {
	private State state;
	
	public void setState(State s ) {
		System.out.println("修改状态");
		state=s;
		state.handle();
	}
}

package com.gof.state;

public class Client {
	public static void main(String[] args) {
		Context context = new Context();
		context.setState(new CheckInState());
	}
}

转载于:https://my.oschina.net/captainliu/blog/904095