Question

I have a Java GUI program that simulates a simple text field(to be like sticky-notes). I want to be able to click the close button and it automatically saves it to a pre-defined text field in the directory.

But I am having trouble with static errors:

File: C:\Users\Adel\Code\Javas\popupText.java  [line: 538]
Error: non-static method open() cannot be referenced from a static context

Here is the main method of my program:

 public static void main(String args[])
  {
    popupText note = new popupText("Untitled-Notepad");
    note.setSize(600,600);
    note.setLocation(200,200);
    note.setVisible(true);

    WindowListener exitListener = new WindowAdapter() {

      @Override
      public void windowClosing(WindowEvent e) {
        int confirm = JOptionPane.showOptionDialog(null, "Are You Sure to Close Application?", "Exit Confirmation", JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE, null, null, null);
        if (confirm == 0) {

          open();   //THIS CAUSES ERROR!!
          System.out.print("Yay I openeed");
          addToStatic();  //just added @ end
          System.exit(0);
        }
      }
    };
    text.append(guts);

    note.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE); 
    note.addWindowListener(exitListener);

The text area is simple and looks like so, and if you like I can give the full code of that too(it’s just a bit unformatted at the moment):

Answer 1

main is static, but the open method is not.

You can only access static methods (and fields) from other static methods.

Without further code, I suggest you try something like note.open() instead (assuming open is a method of note)