Cannot access variables from superclass(constructor issues)

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Java

inheritance

constructor

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
    }
 
}

The SwingFrame Class:

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

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);
    }
        
}

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();

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.