java - 从实例化对象调用主类中的方法

Question

我想做的是:

public class MainClass {
    private UIController uIController;

    MainClass() {
        uIController = new UIController();
    }

    public void MethodIWantToCall() {
        //Do Something
    }
}

UIController 类示例:

public class UIController {
    UIController() {
        //Call a method in MainClass here, for example MethodIWantToCall()
    }

    public void MethodA {
        //Call a method in MainClass here, for example MethodIWantToCall()
    }
}

我想要做的是，当用户与 UI 交互时，UIController 传递给 MainClass 命令，调用其方法或将值返回给 MainClass。

Answer 1

您需要将 MainClass 实例的引用传递给 UIController 实例，例如:

public class UIController {
    private final MainClass mainClass;
    UIController (final MainClass mainClass) {
         this.mainClass = mainClass;
         //Call a method in MainClass here, for example MethodIWantToCall()
         this.mainClass.MethodIWantToCall();
    }

    public void MethodA() {
        //Call a method in MainClass here, for example MethodIWantToCall()
         this.mainClass.MethodIWantToCall();             
    }
}

然后

uIController = new UIController(this);

PS:Java中的方法应该以小写开头。