java design pattern - state pattern

这里的 这个state pattern 的代码就很不错：

另外一个比较简单的代码：

package statepattern;

interface MobileState{
    public void getState();
}

class Ringing implements MobileState{

    @Override
    public void getState(){
        System.out.println("Mobile is in ringing state");
    }
}

class Silent implements MobileState{

    @Override
    public void getState(){
        System.out.println("Mobile is in silent state");
    }
}

class Vibration implements MobileState{

    @Override
    public void getState(){
        System.out.println("Mobile is in vibration state");
    }
}

class MobileContext implements MobileState{
    private MobileState ms;

    public void setMObileState(MobileState ms){
        this.ms = ms;
    }

    //constructor
    public MobileContext(MobileState ms){
        this.ms = ms;
    }

    public void getState(){
        ms.getState();
    }
}

public class StatePatternDemo1 {
    public static void main(String[] args){
        MobileContext ctx = new MobileContext(new Ringing());
        ctx.getState();
        ctx.setMObileState(new Vibration());
        ctx.getState();
        ctx.setMObileState(new Silent());
        ctx.getState();

    }
}