我很难开始新的会话。当我使用菜单选项新游戏时,我得到了一个新实例——实际上,我只想用一个新实例替换当前实例。我尝试了很多不同的事情,但仍然无法解决它......
这是我的代码:
package tictactoe;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class TicTacToe2 extends JFrame implements ActionListener {
char[][] game = new char[3][3];
JButton[][] buttons = new JButton[3][3];
JButton menuItem = new JButton();
JMenu menu = new JMenu ("TicTacToe");
JMenuItem newgame = new JMenuItem("Start New Game"),
exit = new JMenuItem("Exit");
TicTacToe2()
{
super("Tic Tac Toe");
setSize(500, 600);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setVisible(true);
setLayout( new BorderLayout());
JPanel northPanel= new JPanel();
northPanel.setLayout(new FlowLayout(FlowLayout.LEFT));
add("North", northPanel);
JPanel buttonPanel = new JPanel();
buttonPanel.setLayout(new GridLayout(3,3, 4, 4));
add("Center", buttonPanel);
Font font = new Font("Serif", Font.BOLD, 32);
for (int row=0; row < game.length; row++)
{
for (int col =0; col < game[row].length; col++)
{
game[row][col] = ' ';
JButton b = new JButton(" ");
b.setFont(font);
b.setBackground(Color.green);
b.addActionListener(this);
buttons[row][col] = b;
buttonPanel.add(b);
}
}
menu.add(newgame);
menu.add(exit);
newgame.addActionListener(this);
exit.addActionListener(this);
JMenuBar bar = new JMenuBar( );
bar.add(menu);
setJMenuBar(bar);
}
public void actionPerformed(ActionEvent e) {
Object menusource = e.getSource();
if(menusource == newgame){
new TicTacToe2();
}else if(menusource == exit){
System.exit(0);
}
}
public static void main(String[] args) {
TicTacToe2 ttt = new TicTacToe2();
}
}