java基礎（11）-----CallBackListener監聽回調

直接貼一個小demo吧

AbstractCallBackListener類：

/**
 * 監聽回調抽象類
 * @author zisong yue
 * @date 2018-12-05
 */
public abstract class AbstratCallBackListener {
    void callBackOnStateChang(String message){};
}

Food類：

/**
 * @author zisong yue
 * @date 2018-12-05
 */
public class Food {

    private AbstratCallBackListener listener;

    Food(){
        this.listener = new AbstratCallBackListener() {
            @Override
            void callBackOnStateChang(String message) {
                System.out.println(message);
            }
        };
    }

    void callEatFood(){
        EatFood eatFood = new EatFood(listener);
        eatFood.startRatFood();
    }

    public static void main(String[] args) {
        Food food = new Food();
        food.callEatFood();

    }

}

EatFood類：

/**
 * @author zisong yue
 * @date 2018-12-05
 */
public class EatFood {

    AbstratCallBackListener  callBackListener;

    public EatFood(AbstratCallBackListener  callBackListener){
        this.callBackListener = callBackListener;
    }

    void startRatFood(){
        callBackListener.callBackOnStateChang("食物吃完了！");
    }
}

執行Food類中main方法，測試結果：

我們看到，Food類拿到了EatFood類的執行結果。