java 状态模式

package state;
/**
 * 状态模式
 * @author Administrator
 *
 */
public interface RiceState {
	/**
	 * 取的状态
	 */
	public void showState();
}

 

package state;

public class FruitState implements RiceState {

	@Override
	public void showState() {
		System.out.println("this is a fruit state");
	}

}

 

package state;

public class MeetState implements RiceState{

	@Override
	public void showState() {
		System.out.println("this is a meet state");
	}

}

 

package state;

import java.util.HashMap;
import java.util.Map;

public class Eat {
	private RiceState state;
	private Map<String,RiceState> stateMap = new HashMap<String, RiceState>();
	
	public void addState(String name,RiceState state){
		stateMap.put(name, state);
	}
	
	public void getState(String name){
		state = stateMap.get(name);
	}
	public void showState(){
		state.showState();
	}
}

 

package state;

public class StateMain {
public static void main(String[] args) {
	Eat eat = new Eat();
	eat.addState("fruit", new FruitState());
	eat.addState("meet", new MeetState());
	eat.getState("fruit");
	eat.showState();
	eat.getState("meet");
	eat.showState();
}
}