从另一个类更改JFrame的可见性

Question

I am coding a game in which I created a pause menu class PausePanel . In that class, I want to be able to set the JFrame of a different class, MainPanel , but whenever I make a method to do so, I get different errors/issues.

1. Class Game is there to show the PausePanel initialization.
2. Class PausePanel is shown because that's where I need help with the code.

3. Class MainPanel has the JFrame I want to change the visibility of.

     public class Game extends JFrame{ //Contains the game's panel public static void main( String[] args){ Game g1 = new Game(); g1.play(); } public Game(){ setVisible(true); //other stuff } //other methods private class Keys extends KeyAdapter { @Override public void keyPressed(KeyEvent e){ if (e.getKeyCode() == KeyEvent.VK_ESCAPE){ setVisible(false); MainPanel.pause(); PausePanel pp = new PausePanel( ); pp.setBackground( Color.BLACK ); pp.setPreferredSize( new Dimension(WIDTH,HEIGHT) ); pp.setLayout( null ); }}} public class PausePanel extends JFrame{ //Title Screen public PausePanel(){ //other stuff } private class ButtonListener implements ActionListener{ public void actionPerformed(ActionEvent e) { if (e.getSource().equals(continu)){ visibility(true); <------The issue } }}} public class MainPanel extends JPanel{ //Actual game private JPanel jp = new JPanel(); public MainPanel(){ //stuff } public void visibility( boolean b ){ <----This is the method I'd like to be able to use jp.setVisible( b ); } } 

Answer 1

You can use Game as a control class, that listens to PausePanel and invokes methods in MainPanel .
Alternatively you can path a reference to MainPanel instance to PasuePanel :

PausePanel pp = new PausePanel(mainPanel)