Question

基本上，它给我一个问题，即在“for”循环中将每个按钮声明为最终，然后再添加文本。当我这样做时，它给了我很多其他错误。有人可以帮我解决这个问题吗？

import java.awt.GridLayout;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.*;

public class tictactoe {
    public static final int FRAME_WIDTH = 700;
    public static final int FRAME_HEIGHT = 200;
    public static void main(String[] args)          
    {
        int slots = 9;
        JButton[] gameButton = new JButton[9];

        JPanel ticTacToeBoard = new JPanel();
        ticTacToeBoard.setLayout(new GridLayout(3, 3));
        for (int i = 0; i < slots; i++)
        {

                gameButton[i] = new JButton();
                ticTacToeBoard.add(gameButton[i]);

                gameButton[i].addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                gameButton[i].setText("x");
            }
            });
        }



        JButton clearButtons = new JButton("New Game");
        JButton exit = new JButton("Exit");
        JPanel rightPanel = new JPanel();
        JLabel wonLabel = new JLabel();
        rightPanel.setLayout(new GridLayout(1, 3));
        rightPanel.add(wonLabel);
        rightPanel.add(clearButtons);
        rightPanel.add(exit);
        JFrame mainFrame = new JFrame();
        mainFrame.setSize(FRAME_WIDTH, FRAME_HEIGHT);
        mainFrame.setVisible(true);
        mainFrame.setLayout(new GridLayout(1,2));
        mainFrame.add(ticTacToeBoard);
        mainFrame.add(rightPanel);
    }



}

Answer 1

尝试用以下方法替换动作侦听器：

gameButton[i].addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
            ((JButton)e.getSource()).setText("x");
}

关于原始错误：

使用但未使用任何局部变量，形式方法参数或异常处理程序参数在内部类中声明必须声明为final。使用但不是的任何局部变量在内部类中声明必须在内部主体之前明确赋值（§16）类。

Answer 2

只需添加：

String buttonText = "Click Me";
jButton.setText(buttonText);

当点击JAVA Jbutton时，有人可以帮我添加文字吗？

2 个答案: