我的JFrame不刷新

Question

没有人知道如何刷新我的JFrame，所以我可以显示我的新JButton？

private void displayGrid() 
{ 
    Case arrayGrid [][] = Grid.returnArray(); 

    for(int i = 0; i < Settings.returnYGrid(); i++) 
    { 
     for(int j = 0; j < Settings.returnXGrid(); j++) 
     { 
      Case caase = arrayGrid [i][j]; 
      panel.add(caase.getButton()); 
     } 
} 

这里是我创建我的JFrame时使用的方法。然后，我想刷新我的JFrame用同样的方法，因为有些Case我arrayGrid已经改变，什么也没有发生在所有...

我试图设置revalidate()，repaint()并没有什么任。

Answer 1

尝试增加以revalidate和repaint在方法的最后一个电话......

private void displayGrid() 
{ 
    Case arrayGrid [][] = Grid.returnArray(); 

    for(int i = 0; i < Settings.returnYGrid(); i++) 
    { 
     for(int j = 0; j < Settings.returnXGrid(); j++) 
     { 
      Case caase = arrayGrid [i][j]; 
      panel.add(caase.getButton()); 
     } 
    } 
    panel.revalidate(); 
    panel.repaint(); 
} 

与工作示例

public class TestFrame02 { 

    public static void main(String[] args) { 
     new TestFrame02(); 
    } 

    public TestFrame02() { 
     EventQueue.invokeLater(new Runnable() { 
      @Override 
      public void run() { 
       try { 
        UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); 
       } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) { 
       } 

       final JPanel panel = new JPanel(new GridLayout(0, 4)); 
       JButton update = new JButton("Update"); 
       update.addActionListener(new ActionListener() { 
        @Override 
        public void actionPerformed(ActionEvent e) { 
         for (int index = 0; index < 20; index++) { 
          panel.add(new JLabel(Integer.toString(index))); 
         } 
         panel.revalidate(); 
         panel.repaint(); 
        } 
       }); 

       JFrame frame = new JFrame("Test"); 
       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
       frame.setLayout(new BorderLayout()); 
       frame.add(panel); 
       frame.add(update, BorderLayout.SOUTH); 
       frame.setSize(100, 100); 
       frame.setLocationRelativeTo(null); 
       frame.setVisible(true); 
      } 

     }); 
    } 

}