How to access already running instance of a class without creating an actual object

[GrandmstRamRod]

I have a problem with Java GUI. It is hard to explain but I will do my best. I have 2 GUI classes one is class I and other is class G. Class I is initiated from main method. In the class I there is a field (instance of) class G. Reason being that class I collects vital information and passes it to instance of class G. When a button pressed in class I, that sets the class I frame visibility to false and instance of class G to true (showing up the G interface). Problem here is that I want to be able to make a listener in G that sets visibility of I back to true thus displaying the previously edited window. I had a solution of disposing of all frames and creating a new instance but that only shows a new cleared instance of I. Here are some code snippets:Class I:Fields:\[code\]private JFileChooser j;private FileFilter filter;private GUI g; //<--- it is initialized shortly after.private Font masterFont;private JFrame frame;private JButton done;private JButton browse1;private JButton browse2;.....\[/code\]Sets G visible and I invisible:\[code\]class Done implements ActionListener { @Override public void actionPerformed(ActionEvent e) { for (int i = 0; i < 9; i++) { System.out.println(array); } g.setArray(array); System.out.println(array); setText(); frame.setVisible(false); g.setVisible(true); g.setVisible2(false); if (g.clear.isSelected()) { frame.setVisible(true); } }\[/code\]Class G: Note, here I cannot make an instance of I because I keep getting Stack Overflow error.Hard Reset: This one just creates new instance while disposing the rest (possibly wasteful because the old instance of I is not properly closed)\[code\]private class Reset implements ActionListener { @Override public void actionPerformed(ActionEvent arg0) { frame.dispose(); frame2.dispose(); Runnable runnable = new Runnable() { @Override public void run() { Intro g = new Intro(); g.setVisible(true); } }; EventQueue.invokeLater(runnable); }}\[/code\]I want to be able to access the "already running" instance of I without creating any new ones.