JPanel 如何使按钮工作？

Question

当您阅读此代码时，您会意识到我有一个动作事件可以工作，它会打开一个新的 JPanel，显示将运行 ballBounce 的按钮，但现在我卡在试图在该框架内获得一个工作按钮因为该框架已经在 actionEvent 中，有什么帮助吗？

 public class MainJPanelOperation
    {
        public static void main(String[] a)
        {

            JPanel panel1 = new JPanel(new GridLayout(5, 10, 1, 1));
            JButton t1 = new JButton();
            JButton t2 = new JButton();
            JButton letsStart = new JButton("Start The Program!");
            JButton t3 = new JButton();
            JButton t4 = new JButton();
            //letsStart.setBounds(200,250,12,12);
            panel1.add(t1);
            panel1.add(t2);
            panel1.add(letsStart);
            panel1.add(t3);
            panel1.add(t4);
            final JFrame frame1 = new JFrame("Game");
            frame1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
            frame1.add(panel1);
            frame1.setSize(1000,1000);
            frame1.setVisible(true);
            t1.setVisible(false);
            t2.setVisible(false);
            t3.setVisible(false);
            t4.setVisible(false);
            letsStart.setBackground(Color.yellow);
            panel1.setBackground(Color.black);
            letsStart.addActionListener(new ActionListener()
            {
                public void actionPerformed(ActionEvent e)
                {
                    System.out.println("panel 2 main menu intro online");
                    JPanel panelMM = new JPanel(new GridLayout(5, 10, 1, 0));
                    JButton MM1 = new JButton("BallBounce");
                    panelMM.add(MM1);
                    JFrame frameMM = new JFrame("Game/Main Menu");
                    frameMM.add(panelMM);
                    frameMM.setSize(1000,1000);
                    frameMM.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                    frameMM.setVisible(true);
                    frame1.setVisible(false);
                }
            });//end of start sequence

        }
    }

Answer 1

JPanel panelMM = new JPanel(new GridLayout(5, 10, 1, 0));    
JButton MM1 = new JButton("BallBounce");
panelMM.add(MM1);
final JFrame frameMM = new JFrame("Game/Main Menu");
frameMM.add(panelMM);
frameMM.setSize(1000,1000);
frameMM.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

letsStart.addActionListener(new ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                System.out.println("panel 2 main menu intro 
                frameMM.setVisible(true);
                frame1.setVisible(false);
            }
        });

您可以将 frameMM 设为最终版本，无需将所有代码都放在 ActionListener 中。

Answer 2

试试这个：它在动作监听器中工作。

         JButton  MM1 = new JButton("BallBoe");
          MM1.addActionListener(new ActionListener()
            {
             public void actionPerformed(ActionEvent e)
            {
              System.out.println("panel 2");
            }
           });

或class MainJPanelOperation implements ActionListener

你可以使用class MainJPanelOperation { static JButton MM1; //your code }

       MM1=new JButton("Button");
       MM1.addActionListener(this);

在 Main() 之外写一个方法

    public void ActionPerformed(ActionEvent e)
   {
    if(e.getSource()==MM1)
    {
     System.out.print("");
    }
   if(e.getSource()==Buttonobject)
   {
     //your code for button Pressing Event
   }
  }