我有一個JButtons的二維數組，但它似乎只有一個JButton被添加到我的面板

Question

我試圖讓我的JPanel在10乘10的網格中有100個Jbuttons，但是當我運行我的代碼時只有1個大按鈕出現。我發佈了我的代碼，下面所有的導入都被刪除以節省空間，所有必要的導入都在項目中，但這裏沒有顯示。

這裏是我的 「打雪仗」 類：

package snowballfight; 
public class SnowballFight extends JFrame implements ActionListener{ 
    private JTextField display = new JTextField("Welcome to the SnowBall fight!"); 
    /** 
    * @param args the command line arguments 
    */ 
    public SnowballFight(){ 
     setLayout(new BorderLayout(1,2)); 
     JPanel panel = new JPanel(); 
     panel.setLayout(new GridLayout(10, 10)); 
     display.setHorizontalAlignment(JButton.CENTER); 
     display.setEditable(false); 
     add(display, BorderLayout.NORTH); 
     add(panel, BorderLayout.SOUTH); 
    } 
    public static void main(String[] args) { 
     SnowballFight frame = new SnowballFight(); 
     GameBoard game = new GameBoard(frame); 
    } 
    public void actionPerformed(ActionEvent event) { 
    } 
} 

和我的 「遊戲鍵盤」 類：

package snowballfight; 
public class GameBoard extends JFrame implements ActionListener{ 
    private JButton[][] game = new JButton[10][10]; 
    private JTextField display = new JTextField("Welcome to the SnowBall fight!"); 
    private Opponent[] opponents = new Opponent[4]; 


    public GameBoard(SnowballFight frame){ 
     for (int row = 0; row < game.length; row++) { 
      for (int col = 0; col < game[row].length; col++) { 
       game[row][col] = new JButton(); 
       game[row][col].setBackground(Color.gray); 
       game[row][col].addActionListener(this); 
       frame.add(game[row][col]); 
      } 
     } 
     frame.setTitle("Snowball Fight"); 
     frame.setSize(200, 150); 
     frame.setLocationRelativeTo(null); 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     frame.setVisible(true); 
    } 
    public boolean isGameOver(){ 
     for (int opponent = 0; opponent < opponents.length; opponent++) { 
      if(opponents[opponent].isSoaked() == false){ 
       return false; 
      } 
     } 
     return true; 
    } 
    public void actionPerformed(ActionEvent event) { 
    } 
} 

新遊戲鍵盤類：

public GameBoard(SnowballFight frame){ 
     JPanel panel = new JPanel(); 
     panel.setLayout(new GridLayout(10, 10)); 
     for (int row = 0; row < game.length; row++) { 
      for (int col = 0; col < game[row].length; col++) { 
       game[row][col] = new JButton(); 
       game[row][col].setBackground(Color.gray); 
       game[row][col].addActionListener(this); 
       panel.add(game[row][col]); 
      } 
     } 
     add(display, BorderLayout.NORTH); 
     add(panel, BorderLayout.SOUTH); 
     frame.setTitle("Snowball Fight"); 
     frame.setSize(200, 150); 
     frame.setLocationRelativeTo(null); 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     frame.setVisible(true); 
    } 

Answer 1

frame.add(game[row][col]); 

你一定要明白JFrame的默認佈局是BorderLayout對不對？並且只有一個組件可以出現在BorderLayout的任何一個區域中？改爲使用GridLayout。