状态模式

 

状态模式图 ，最根本的就是状态切换，这里采用gof推荐的在具体的状态中进行状态切换

具体的类如下：

 

publicinterface State {

    publicvoid call();

    publicvoid countTimes();

    public String showState();

}

 

 

publicclass ConnectState implements State {

    private MobileTelephone mobile;

    public ConnectState(MobileTelephone mobile){

       this.mobile=mobile;

    }

    @Override

    publicvoid call() {

       // TODO Auto-generated method stub

       System.out.println("用户正在通话，请稍后再拨....");

       mobile.setState(mobile.getWaitState());

       System.out.println("手机状态进入("+mobile.getWaitState().showState()+")");

    }

 

    @Override

    publicvoid countTimes() {

       // TODO Auto-generated method stub

       System.out.println("计时处理.....");

       System.out.println("通话结束，计时结束");

    }

 

    @Override

    public String showState() {

       // TODO Auto-generated method stub

       return"Mobile is connecting";

    }

 

}

 

 

publicclass WaitState implements State{

    private MobileTelephone mobile;

    public WaitState(MobileTelephone mobile){

    this.mobile=mobile;

    }

    @Override

    publicvoid call() {

       // TODO Auto-generated method stub

       System.out.println("电话连接成功，可以通话.....");

       mobile.setState(mobile.getConnectState());

       System.out.println("手机状态进入("+mobile.getConnectState().showState()+")");

    }

  

    @Override

    publicvoid countTimes() {

       // TODO Auto-generated method stub

       System.out.println("电话不在连接状态，不能计时....");

      

    }

 

    @Override

    public String showState() {

       // TODO Auto-generated method stub

       return"Mobile is waiting";

    }

}

 

 

publicclass StopState implements State {

    private MobileTelephone mobile;

    public StopState(MobileTelephone mobile){

       this.mobile=mobile;

    }

    @Override

    publicvoid call() {

       // TODO Auto-generated method stub

       System.out.println("用户已关机，请稍后在拨....");

       mobile.setState(mobile.getWaitState());

       System.out.println("手机状态进入("+mobile.getWaitState().showState()+")");

    }

 

    @Override

    publicvoid countTimes() {

       // TODO Auto-generated method stub

       System.out.println("手机已关机，计时处理已关闭.....");

    }

 

    @Override

    public String showState() {

       // TODO Auto-generated method stub

       return"手机处于关机状态";

    }

   

 

}

 

 

publicclass MobileTelephone{

    //private State waitState=new WaitState();

    //private State connectState=new ConnectState();

   // private IState stopState=new StopState();

    private State connectState,waitState,stopState;

    private State state;

    //构造函数，初始化mobile状态

    public MobileTelephone(){

        connectState=new ConnectState(this);

       waitState=new WaitState(this);

       stopState=new StopState(this);

       state=stopState;

    }

    //private State state=waitState;

    publicvoid call(){

       state.call();

    }

    publicvoid countTimes(){

       state.countTimes();

    }

    publicvoid showState(State concreteState){

       this.state=concreteState;

    }

    public State getState() {

       returnstate;

    }

    publicvoid setState(State state) {

       this.state = state;

    }

    public State getConnectState() {

       returnconnectState;

    }

    publicvoid setConnectState(State connectState) {

       this.connectState = connectState;

    }

    public State getWaitState() {

       returnwaitState;

    }

    publicvoid setWaitState(State waitState) {

       this.waitState = waitState;

    }

}

 

 

publicclass Test {

    publicstaticvoid main(String[] args){

       MobileTelephone mobile=new MobileTelephone();

       mobile.call();

       mobile.countTimes();

    }

}

运行结果如下：