I'm making a game in Java and whenever I try to bring up my in game menu the program minimizes?

The menu is displayed on game startup and works fine, but once in game you can hit escape to bring up the menu again and this will cause the program to minimize. After I unminimize the game I can hit escape again and the menu screen will appear as intended. The return button also works as intended. What is going on here?

EDIT Here is my SSCCE: You will just need to add the imports and unimplemented methods for BullsEyePanel. I hope this helps!

public class Board {

    public static void main(String[] args) {
        javax.swing.SwingUtilities.invokeLater(new Runnable() {

            public void run() {
                createAndShowGUI();
            }
        });
    }

    public static void createAndShowGUI() {
        Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
        int B_WIDTH = (int) dim.getWidth();
        int B_HEIGHT = (int) dim.getHeight();
        JFrame f = new JFrame("Children of The Ape");
        f.setDefaultCloseOperation(f.EXIT_ON_CLOSE);

        f.setUndecorated(true);
        f.pack();
        f.setBackground(Color.BLACK);
        f.setVisible(true);
        f.setResizable(false);

        // Get graphics configuration...
        GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
        GraphicsDevice gd = ge.getDefaultScreenDevice();

        // Change to full screen
        gd.setFullScreenWindow(f);
        if (gd.isDisplayChangeSupported()) {
            gd.setDisplayMode(new DisplayMode(B_WIDTH, B_HEIGHT, 32, DisplayMode.REFRESH_RATE_UNKNOWN));
        }

        MenuPanel menu = new MenuPanel(f);
        f.getContentPane().add(menu);
        f.validate();
    }
}

class BullsEyePanel extends JPanel implements MouseInputListener, ActionListener {

    JFrame frame;

    public BullsEyePanel(JFrame f) {
        frame = f;
        addKeyListener(new TAdapter());
        setFocusable(true);
        setVisible(true);
        repaint();
    }

    private void openMenu() {
        frame.getContentPane().add(new MenuPanel(this));
        setVisible(false);
    }

    private class TAdapter extends KeyAdapter {

        public void keyPressed(KeyEvent arg0) {
            if (arg0.getKeyCode() == 27) {
                openMenu();
            }
        }
    }
}

class MenuPanel extends JPanel {

    JButton btnExit;
    JButton btnNewGame;
    JFrame f;
    BullsEyePanel panel;

    MenuPanel(JFrame frame) { //this menu constructor is only called on program startup
        f = frame;
        setBackground(Color.black);
        setFocusable(true);

        btnNewGame = new JButton("New Game");
        btnExit = new JButton("Exit");
        btnNewGame.addActionListener(new newGameListener());
        btnExit.addActionListener(new exitListener());
        add(btnNewGame);
        add(btnExit);

        setVisible(true);
    }

    MenuPanel(BullsEyePanel bullsEyePanel) { //this menu constructor is called when ESC is typed
        f = bullsEyePanel.frame;
        setBackground(Color.black);
        setFocusable(true);

        btnNewGame = new JButton("New Game");
        btnExit = new JButton("Exit");
        btnNewGame.addActionListener(new newGameListener());
        btnExit.addActionListener(new exitListener());
        add(btnNewGame);
        add(btnExit);

        setVisible(true);
    }

    public class exitListener implements ActionListener {

        pub开发者_JAVA百科lic void actionPerformed(ActionEvent arg0) {
            System.exit(0);
        }
    }

    public class newGameListener implements ActionListener {

        public void actionPerformed(ActionEvent arg0) {
            setVisible(false);
            f.getContentPane().add(new BullsEyePanel(f), BorderLayout.CENTER);
        }
    }
}

Instead of variant constructors, let the menu panel undertake its removal and restoration, as suggested below. See also this related example.

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class Board {

    public static void main(String[] args) {
        javax.swing.SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {
                new Board().createAndShowGUI();
            }
        });
    }

    public void createAndShowGUI() {
        JFrame f = new JFrame("Children of The Board");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setBackground(Color.BLACK);
        MenuPanel menu = new MenuPanel(f);
        f.add(menu, BorderLayout.NORTH);
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);
    }
}

class MenuPanel extends JPanel {

    private JButton btnExit = new JButton("Exit");
    private JButton btnNewGame = new JButton("New Game");
    private BullsEyePanel gamePanel;
    private JFrame parent;

    MenuPanel(JFrame parent) {
        this.gamePanel = new BullsEyePanel(this);
        this.parent = parent;
        this.setBackground(Color.black);
        this.setFocusable(true);
        btnNewGame.addActionListener(new newGameListener());
        btnExit.addActionListener(new exitListener());
        this.add(btnNewGame);
        this.add(btnExit);
        this.setVisible(true);
    }

    public void restore() {
        parent.remove(gamePanel);
        parent.add(this, BorderLayout.NORTH);
        parent.pack();
        parent.setLocationRelativeTo(null);
    }

    private class exitListener implements ActionListener {

        @Override
        public void actionPerformed(ActionEvent arg0) {
            System.exit(0);
        }
    }

    private class newGameListener implements ActionListener {

        @Override
        public void actionPerformed(ActionEvent arg0) {
            parent.remove(MenuPanel.this);
            parent.add(gamePanel, BorderLayout.CENTER);
            parent.pack();
            parent.setLocationRelativeTo(null);
            gamePanel.requestFocus();
        }
    }
}

class BullsEyePanel extends JPanel {

    private MenuPanel menuPanel;

    public BullsEyePanel(MenuPanel menu) {
        this.menuPanel = menu;
        this.setFocusable(true);
        this.addKeyListener(new TAdapter());
        this.setPreferredSize(new Dimension(320, 240)); // placeholder
        this.setVisible(true);
    }

    private class TAdapter extends KeyAdapter {

        @Override
        public void keyPressed(KeyEvent code) {
            if (code.getKeyCode() == KeyEvent.VK_ESCAPE) {
                menuPanel.restore();
            }
        }
    }
}