如何在一个JFrame内切换到JPanel？

我正在写一个俄罗斯方块游戏。当应用程序通过按钮“播放”打开Jlabel时。如何在现有的Jframe内切换到不同的标签（Board）？如何在一个JFrame内切换到JPanel？

像这样，它直接打开游戏..但首先我想使用ButtonPage类来显示一些按钮，然后调用游戏的欢迎屏幕。

public class Tetris extends JFrame { 

    public Tetris(){ 

     // JFrame Properties 
     setSize(198, 409); 
     setResizable(false); 
     setTitle("Tetris"); 
     setDefaultCloseOperation(EXIT_ON_CLOSE); 

//  ButtonPage buttons = new ButtonPage(); 
//  add(buttons); 
//  buttons.setOpaque(true); 

     Board board = new Board(this); 
     add(board); 
     board.start(); 

    } // end of constructor 
    public static void main(String[] args){ 

     Tetris game = new Tetris(); 
     game.setLocationRelativeTo(null);   
     game.setVisible(true);   
     game.setLayout(null); 
    } // end of main 

} // end of class

这是ButtonPage类。

public class ButtonPage extends JPanel implements ActionListener{ 

    JButton buttonPLAY = new JButton(); 
    JLabel backgroundImage = new JLabel(); 

    public ButtonPage(){ 

     setLayout(null); 

     ImageIcon buttonIcon = new ImageIcon(getClass().getResource("PlayButton.png")); 
     ImageIcon buttonIconHover = new ImageIcon(getClass().getResource("PlayButtonHover.png")); 
     ImageIcon buttonIconClicked = new ImageIcon(getClass().getResource("PlayButtonClicked.png")); 
     int buttonHeight = buttonIcon.getIconHeight(); 
     int buttonWidth = buttonIcon.getIconWidth(); 


     buttonPLAY.addActionListener(this); 
     buttonPLAY.setActionCommand("Play"); 
     buttonPLAY.setIcon(buttonIcon); 
     buttonPLAY.setRolloverIcon(buttonIconHover); 
     buttonPLAY.setPressedIcon(buttonIconClicked); 
     buttonPLAY.setBorderPainted(false);   

     add(buttonPLAY); 


     Dimension size2 = getSize();   
     Dimension size = buttonPLAY.getPreferredSize(); 
     buttonPLAY.setBounds((192 - buttonWidth)/2, 100 ,buttonWidth, buttonHeight); 


    }// end of constructor 

    @Override 
    public void actionPerformed(ActionEvent e) { 
     if ("Play".equals(e.getActionCommand())) { 

     Tetris game = new Tetris();   
     // opens the window in the middle of the screen 
     game.setLocationRelativeTo(null); 
     // set the tetris window visible, unless its true - its invisible DUH! 
     game.setVisible(true);   
     game.setLayout(null); 

     } 
    } // end of actionPerformed 

}// end of class

使用actionPerformed方法我可以打开一个新的帧的比赛，但我不知道如何切换面板。

在此先感谢您的任何提示！

来源

2012-10-26 Kuba Spatny