如何在java中设置数组中JButtons的颜色？

Question

假设有一个名称按钮数组:
private JButton buttons [] = new JButton [9];
如何将此阵列中所有按钮的颜色设置为蓝色？

这是我的整个代码:这是一个使用按钮的Tic Tac Toe游戏.

import java.awt.*; 
import java.awt.event.*;
import javax.swing.*;
import java.awt.BorderLayout;

public class TicTacToe implements ActionListener {
private JButton buttons[] = new JButton[9];
private JFrame window = new JFrame("Tic Tac Toe");
private boolean win = false;
private int count = 0;
private int Xwins = 0, Owins = 0;
private String letter = "";
private int[][] winCombinations = new int[][] {
        {0, 1, 2}, {3, 4, 5}, {6, 7, 8}, //horizontal wins
        {0, 3, 6}, {1, 4, 7}, {2, 5, 8}, //vertical wins
        {0, 4, 8}, {2, 4, 6}                     //diagonal wins
};
String name1 = JOptionPane.showInputDialog("Please enter first player's name");
String name2 = JOptionPane.showInputDialog("Please enter second player's name");

public TicTacToe(){
    JOptionPane.showMessageDialog(null,"Remember Player 1 is X and Player 2 is O.");
    window.setSize(300,300);
    window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    window.setLayout(new GridLayout(3,3));
    window.setVisible(true);


      for(int i=0; i<=8; i++){
          buttons[i] = new JButton();
          window.add(buttons[i]);
          buttons[i].addActionListener(this);
          buttons[i].setBackground(Color.MAGENTA);
  }
      for (JButton button: buttons) {
           button.setBackground(Color.BLUE);
        }

}

public void actionPerformed(ActionEvent event) {
        count++;
        if(count % 2 == 0){
            letter = "O";

        }else{
            letter = "X";
        }
         JButton pressedButton = (JButton)event.getSource(); 
         pressedButton.setText(letter);
         pressedButton.setEnabled(false);
         pressedButton.setBackground(Color.WHITE);


    //Determine who won
    for(int i=0; i<=7; i++){
        if( buttons[winCombinations[i][0]].getText().equals(buttons[winCombinations[i][1]].getText()) && 
                buttons[winCombinations[i][1]].getText().equals(buttons[winCombinations[i][2]].getText()) && 
                buttons[winCombinations[i][0]].getText() != ""){
                win = true;
            }
        }
        if(win == true){
            if(letter == "X"){
                JOptionPane.showMessageDialog(null, name1 + " wins the game!");
            }else{
                JOptionPane.showMessageDialog(null, name2 + " wins the game!");
            }
            playAgain();
        }else if(count == 9 && win == false){
            JOptionPane.showMessageDialog(null, "The game is tied!");
            playAgain();
        }
    } 

public void playAgain(){
    if(letter == "X"){
        Xwins++;
    }else{
        Owins++;
    }
    JOptionPane.showMessageDialog(null, name1 + " has won this many times: " + Xwins);
    JOptionPane.showMessageDialog(null, name2 + " has won this many times: " + Owins);
    int response = JOptionPane.showConfirmDialog(null, "Would you like to play again?", "Confirm", JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE);

    if(response == JOptionPane.YES_OPTION){
        reset();
    }else{
        System.exit(0);
    }
}

  public void reset() {
      for(int i = 0; i<=8; i++) {
              buttons[i].setText("");
              buttons[i].setEnabled(true); 
      }
      win = false;
      count = 0;
  }  

public static void main(String[] args){
    TicTacToe play = new TicTacToe();
   }
}

Answer 1

这实际上是一个副作用JButton.

背景和内容是两个不同的概念.虽然您可以更改背景颜色,但它可能不会更改按钮的内容区域.事实上,它可能在不同的外观和感觉下表现不同.

相反,使用JLabel,它更容易控制......

public class TicTacToe implements ActionListener {

    private JLabel labels[] = new JLabel[9];
    private JFrame window = new JFrame("Tic Tac Toe");
    private boolean win = false;
    private int count = 0;
    private int Xwins = 0, Owins = 0;
    private String letter = "";
    private int[][] winCombinations = new int[][]{
        {0, 1, 2}, {3, 4, 5}, {6, 7, 8}, //horizontal wins
        {0, 3, 6}, {1, 4, 7}, {2, 5, 8}, //vertical wins
        {0, 4, 8}, {2, 4, 6} //diagonal wins
    };
    String name1 = JOptionPane.showInputDialog("Please enter first player's name");
    String name2 = JOptionPane.showInputDialog("Please enter second player's name");

    public TicTacToe() {
        JOptionPane.showMessageDialog(null, "Remember Player 1 is X and Player 2 is O.");
        window.setSize(300, 300);
        window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        window.setLayout(new GridLayout(3, 3));
        window.setVisible(true);

        MouseHandler handler = new MouseHandler();

        for (int i = 0; i <= 8; i++) {
            labels[i] = new JLabel();
            labels[i].setOpaque(true);
            labels[i].setBorder(new LineBorder(Color.LIGHT_GRAY));
            labels[i].setHorizontalAlignment(JLabel.CENTER);
            window.add(labels[i]);
            labels[i].addMouseListener(handler);
            labels[i].setBackground(Color.MAGENTA);
        }
//        for (JButton button : buttons) {
//            button.setBackground(Color.BLUE);
//        }

    }

    public void actionPerformed(ActionEvent event) {
    }

    public void playAgain() {
        if (letter == "X") {
            Xwins++;
        } else {
            Owins++;
        }
        JOptionPane.showMessageDialog(null, name1 + " has won this many times: " + Xwins);
        JOptionPane.showMessageDialog(null, name2 + " has won this many times: " + Owins);
        int response = JOptionPane.showConfirmDialog(null, "Would you like to play again?", "Confirm", JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE);

        if (response == JOptionPane.YES_OPTION) {
            reset();
        } else {
            System.exit(0);
        }
    }

    public void reset() {
        for (int i = 0; i <= 8; i++) {
            labels[i].setText("");
            labels[i].setEnabled(true);
        }
        win = false;
        count = 0;
    }

    public class MouseHandler extends MouseAdapter {

        @Override
        public void mouseClicked(MouseEvent event) {
            count++;
            if (count % 2 == 0) {
                letter = "O";

            } else {
                letter = "X";
            }
            JLabel pressedLabel = (JLabel) event.getSource();
            pressedLabel.setText(letter);
            pressedLabel.setEnabled(false);
            pressedLabel.setBackground(Color.WHITE);


            //Determine who won
            for (int i = 0; i <= 7; i++) {
                if (labels[winCombinations[i][0]].getText().equals(labels[winCombinations[i][1]].getText())
                                && labels[winCombinations[i][1]].getText().equals(labels[winCombinations[i][2]].getText())
                                && labels[winCombinations[i][0]].getText() != "") {
                    win = true;
                }
            }
            if (win == true) {
                if (letter == "X") {
                    JOptionPane.showMessageDialog(null, name1 + " wins the game!");
                } else {
                    JOptionPane.showMessageDialog(null, name2 + " wins the game!");
                }
                playAgain();
            } else if (count == 9 && win == false) {
                JOptionPane.showMessageDialog(null, "The game is tied!");
                playAgain();
            }
        }
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (Exception ex) {
                }

                TicTacToe play = new TicTacToe();
            }
        });
    }
}

你可能拥有的唯一另一个选择是创建一个只能绘制背景颜色的按钮实现,这需要你延伸AbstractButton,但说实话,这是很多工作......