基本上,这给我一个问题,那就是在添加文本之前,将“ for”循环中的每个按钮声明为最终按钮。当我这样做时,它给了我很多其他错误。有人可以帮我这个忙吗?
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);
}
}
最佳答案
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:
使用任何局部变量,形式化方法参数或异常处理程序参数,但不使用
在内部类中声明的必须声明为final。任何局部变量,已使用但未使用
在内部类中声明的声明必须在内部主体之前明确赋值(第16节)
类。