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问题描述

你好。



我是新手,我真的希望你们能教我一两件事。



我只想从超类访问某些变量的值。但是我的构造函数给了我一个问题:



Hello.

Im a newbie and i really hope you guys can teach me a thing or two.

I just want to access, values of certain variables, from the superclass. But my constructor is giving me issue:

public class Calculator extends SwingFrame {

    SwingFrame testingobj = null;

    public Calculator(SwingFrame frame) {
        this.testingobj = frame;
    }

    public int test = 0;

    void someMethod(){
        //method
    }

}





SwingFrame类:



The SwingFrame Class:

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
    Calculator callthemethod = new Calculator(this);
    callthemethod.someMethod();





这完美无缺。每次按下JButton,它都会调用该方法。



以下是问题:







This works perfectly. It will call the method, every time i press the JButton.

Here is the issue:


public class Mastering extends Calculator {

    public Mastering(SwingFrame frame) {
        super(frame);
    }

}





所以现在我的Mastering类是Calculator的子类,将继承构造函数。



但是如果我想访问Calculator类中的变量怎么办?



我试过:





So now my Mastering class is subclass of Calculator and will inherit the constructor.

But what if i want to access, variables from the Calculator class?

I tryed:

Calculator test = new Calculator();





它告诉我,类:计算器类计算器,不能应用于给定类型:


需要
:SwingFrame。



现在,我不知道如何从Calculator类调用变量(Calculator test = new Calculator();是唯一的方法,我知道如何从其他类中访问变量。)



请帮助我,我一直在寻找几小时和几天的解决方案。但我卡住了。



非常感谢。



It tells me, that: Calculator in class Calculator, cannot be applied to given types:

required: SwingFrame.

And now, i dont know how to call variables, from the Calculator class(the Calculator test = new Calculator(); is the only way, i know how to access variables from other the class).

Please help me, i just kept looking for solutions for hours and days. But im stuck.

Thank you very much.

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08-22 13:54