java - 在实现actionListener的jpanels之间切换

Question

这个问题已经有答案了:

Implementing back/forward buttons in Swing (3 个回答)

已关闭 4 年前。

我正在为我的 java 游戏构建一个菜单，当我单击按钮时，我需要能够切换到我的游戏 JPanel。这是我所拥有的

public class Menu extends JPanel implements ActionListener {

protected JFrame frame;
JButton btnStart = new JButton();

public Menu(JFrame j) {

    super();
    frame = j;

    //creating and styling button

    btnStart.addActionListener(new java.awt.event.ActionListener() {
        public void actionPerformed(java.awt.event.ActionEvent evt) {
            StartGame();
        }
    });



}

private void StartGame(){
    frame.getContentPane().removeAll();
    frame.getContentPane().add(new Main(frame));
    frame.repaint();

}

`公共(public)类 Main 扩展 Universe 实现 ActionListener {

Timer timer = new Timer(75, this);
JFrame frame;



//@Override

public void actionPerformed(ActionEvent e) {

    repaint();;
    if(isLoss()){
       timer.stop();
   }
   //update cretures
}


public Main(JFrame frame) {
    super();

    frame.setLayout(null);
   frame.setLayout(null);
    //frame.getContentPane().setLayout(null);
    this.setBackground(Color.BLACK);
    this.map = new Map();
    StartUpHeight = 100;
    this.Size = 30;
    //this.playerCol = new Collision(map, pacman, Size);
    pacman = new Player(1*Size, 4*Size, Size / 5, map, this.Size);

    red = new RedGhost(9*Size, 8*Size, Size / 6, map, pacman, this.Size);
    pinky = new PinkGhost(8*Size, 10*Size, Size / 6, map, pacman, this.Size);
    inky = new BlueGhost(9*Size, 10*Size, Size / 6, map, pacman, this.Size, red);
    clyde = new YellowGhost(10*Size, 10*Size, Size/6, map, pacman, this.Size);
    timer.start();
    this.frame = frame;
    this.frame.addKeyListener(new KeyAdapter() {
        @Override
        public void keyPressed(KeyEvent e) {
            // TODO Auto-generated method stub

            pacman.keyPressed(e, Size);
        }

        @Override
        public void keyReleased(KeyEvent e) {
            // TODO Auto-generated method stub
            pacman.keyReleased(e);
        }
    });
    setUpPanel();

}

@Override
public void paint(Graphics g) {

    //drawing map


    //drawing pacman

    //drawing ghosts

}

`

到目前为止，我尝试了在互联网上找到的所有内容。 Main 继承自 jpanel，并像 Menu 一样实现操作监听器。执行此代码后，我的 jframe 就会清除。我尝试重新绘制它没有帮助。任何帮助表示赞赏。谢谢

Answer 1

当你调用 repaint() 方法时，你还应该调用 revalidate() 方法。另外，你能展示一下你的主类代码吗？您是否已将按钮添加到框架中？