Jframe inheritance question

Question

hi why is it when i set the variable inside secondframe class
it just doesn't stick. i have a example that describes my problem better.
i can see that when void show is called that it makes a new instance of
second frame class so how would i fix this.
i know i could scope int x through the show method and use it that way
but im wanting to change varibles inside second class dynamicly
any ideas thanks
firstclass with frame1
public class Main {
    public static void main(String[] args) {
          firstframe frame = new firstframe();
          frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
          frame.setSize(270, 500);
          frame.setVisible(true);
        frame.setAlwaysOnTop(true);
class firstframe extends JFrame
    private int x = 10;
    firstframe(){
    super.setTitle("first frame");
    System.out.println("first result :" + x);
    secondframe frame2 = new secondframe();
    secondclass.show();
}second class
public class secondclass {
    public static void show()
          secondframe frame = new secondframe();
          frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
          frame.setSize(270, 500)thanks;
          frame.setVisible(true);
        frame.setAlwaysOnTop(true);
class secondframe extends JFrame
    private int x;
    public secondframe(){
        super.setTitle("second frame");
        System.out.println("end result :" + x);
    public void setvaribles(int x){
        this.x = x;
}

Answer 1

Use proper Java naming conventions.
Class names should be upper cased: ie FirstFrame, not firstframe.
Method names are also upper cased except the first word: ie. setVariables, not setvariables.
Why is show a static method? The only static method should be the main(...) method.
You don't even need a show() method, the code to create the frame should be in the constructor.
Also, applications should only have a single JFrame. Other windows should be JDialogs.