在 GridLayout 上方添加 JLabel

Question

我很难包含 GridLayout，因此在其上方添加 JLabel 不会丢失任何东西。我尝试了一些不同的东西，但似乎仍然无法正确对齐。

这是一款井字游戏：

package assg01;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class TicTacToe extends JFrame {
   private static final String TITLE = "Tic Tac Toe";
   private static final int WIDTH = 700;
   private static final int HEIGHT = 808;
   private Container content;
   private JLabel result;
   private JButton[] cells;
   private JButton exitButton;
   private JButton initButton;
   private CellButtonHandler[] cellHandlers;
   private ExitButtonHandler exitHandler;
   private InitButtonHandler initHandler;
   private boolean noughts;
   private boolean gameOver;
   private Container panel;
   private ImageIcon x,empty,o;

   public TicTacToe() {
    // Necessary initialization code
       setTitle(TITLE);
       setSize(WIDTH, HEIGHT);
       setDefaultCloseOperation(EXIT_ON_CLOSE);
       // Get content pane
       panel = getContentPane();
       //content.setBackground(Color.blue.darker())
       // Set layout
       panel.setLayout(new GridLayout(3, 3, 5, 5));
       // Create cells and handlers
       cells = new JButton[9];
       cellHandlers = new CellButtonHandler[9];
       for (int i = 0; i < 9; i++) {
           cells[i] = new JButton();
           cellHandlers[i] = new CellButtonHandler();
           cells[i].addActionListener(cellHandlers[i]);
       }
       // Create result label
       //result.setForeground(Color.white);
       // Add elements to the grid content pane
       for (int i = 0; i < 9; i++) {
           panel.add((cells[i]));
       }      
       init();
   }
   public void init() {
       // Initialize

      JPanel topPanel = new JPanel();
      add(topPanel,BorderLayout.NORTH);
        JLabel myLabel = new JLabel ("Label") ;
        topPanel.add(myLabel);

       x=new ImageIcon("images/x.png");
       empty=new ImageIcon("images/empty.png");
       o=new ImageIcon("images/o.png"); 
       noughts = true;
       gameOver = false;
       // Initialize text in buttons
       for (int i = 0; i < 9; i++) {
           char ch = (char) (i + 1);
           cells[i].setIcon(empty);
           cells[i].setName(""+ch);
       }
       // Initialize result label
       setVisible(true);
   }

Answer 1

I'm having a hard time with containing a GridLayout so that adding a JLabel above it won't throw off anything.

这里的技巧是组合布局：

创建一个 JPanel 和 BorderLayout
将 GridLayout 添加到 BorderLayout 的 CENTER。
将 JLabel 添加到 BorderLayout 的 PAGE_START。

另一种选择是使用 TitledBorder（而不是 JLabel）作为 GridLayout。

在 GridLayout 上方添加 JLabel

Adding a JLabel above a GridLayout

java

swing

containers

layout-manager

grid-layout