Question

我想做的是：

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()
    }
}

UIController类示例：

$Data::Dumper::Indent

我想要做的是UIController传递给MainClass命令，调用其方法或在用户与UI交互时将值返回给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中的方法应该从小写开始。

Answer 2

您可以创建实例字段：

public class MainClass {
    public static MainClass instance;
    public MainClass() {
        instance=this;
    }
    public void method() {}
}

然后，调用：MainClass.instance.method（）;或者：

public class MainClass {
    public MainClass() {
        new AnotherClass(this);
    }
    public void method() {}
}
public class AnotherClass {
    public AnotherClass(MainClass main) {
        main.method();
    }
}

从实例化对象中调用主类中的方法

2 个答案: