참가자들

암호

public class Main {

    public static void main(String[] args) {
        Context c = new Context(new ConcreteStateA());
        c.request();
        c.request();
        c.request();
        c.request();
    }
}

public interface State {
    void handle(Context context);
}

public class ConcreteStateA implements State {

    @Override
    public void handle(Context context) {
        context.setState(new ConcreteStateB());
    }
}

public class ConcreteStateB implements State {

    @Override
    public void handle(Context context) {
        context.setState(new ConcreteStateA());
    }
}

public class Context {

    private State state;

    public Context(State state) {
        setState(state);
    }

    public State getState() {
        return state;
    }

    public void setState(State state) {
        this.state = state;
        System.out.println("State: " + state.getClass().getSimpleName());
    }

    public void request() {
        state.handle(this);
    }
}

산출

State: ConcreteStateA
State: ConcreteStateB
State: ConcreteStateA
State: ConcreteStateB
State: ConcreteStateA

eidherjulian61 / 디자인 패턴