Java如何做带复选框的菜单实例代码 Java如何做带复选框的菜单实例

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说明：上面是我用Java做的扫雷游戏，其中就用到了带复选框式的菜单，原来也是用JCheckBoxMenuItem做的，但发现实在是问题多多，后干脆就用普通的JMenuItem来做，效果也不错。实际上说穿了很简单，就是在菜单的文本上做文章，前面加上一个 √ 即可。通过比较文本内容来判断是显示选中还是未选中，前面加还是不加 √ ，同时其他的文本内容如何变化，就好像扫雷的难度，初级、中级、高级只能选中一个。
代码：

package com.game.mine; import java.awt.Font; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JFrame; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JMenuItem; import javax.swing.JOptionPane; import javax.swing.JCheckBoxMenuItem; /** * 功能：游戏窗口
* 作者：我是小木鱼（Lag）
*/public class GameFrame extends JFrame implements ActionListener{ private static final long serialVersionUID = 2596945399892762751L; /** 游戏面板 */ private GamePanel gamePanel; /** 菜单控件 */JMenuItem jmi_easy,jmi_normal,jmi_hard; /*** 功能：构造函数
*/ public GameFrame() {try{//窗口this.setTitle("扫雷"); this.setLayout(null); this.setResizable(false); this.setLocationRelativeTo(null); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //菜单JMenuBar jmb_minesweeper = new JMenuBar(); JMenu jm_game = new JMenu("游戏"); jm_game.setFont(new Font("微软雅黑",Font.PLAIN,12)); JMenuItem jmi_new = jm_game.add("开局"); jmi_new.setFont(new Font("微软雅黑",Font.PLAIN,12)); jmi_new.addActionListener(this); jmi_new.setActionCommand("new"); jm_game.addSeparator(); this.jmi_easy = jm_game.add("√ 初级"); this.jmi_easy.setFont(new Font("微软雅黑",Font.PLAIN,12)); this.jmi_easy.addActionListener(this); this.jmi_easy.setActionCommand("easy"); this.jmi_normal = jm_game.add("中级"); this.jmi_normal.setFont(new Font("微软雅黑",Font.PLAIN,12)); this.jmi_normal.addActionListener(this); this.jmi_normal.setActionCommand("normal"); this.jmi_hard = jm_game.add("高级"); this.jmi_hard.setFont(new Font("微软雅黑",Font.PLAIN,12)); this.jmi_hard.addActionListener(this); this.jmi_hard.setActionCommand("hard"); jm_game.addSeparator(); JMenuItem jmi_exit = jm_game.add("退出"); jmi_exit.setFont(new Font("微软雅黑",Font.PLAIN,12)); jmi_exit.addActionListener(this); jmi_exit.setActionCommand("exit"); jmb_minesweeper.add(jm_game); JMenu jm_help = new JMenu("帮助"); jm_help.setFont(new Font("微软雅黑",Font.PLAIN,12)); JMenuItem jmi_about = jm_help.add("关于"); jmi_about.setFont(new Font("微软雅黑",Font.PLAIN,12)); jmi_about.addActionListener(this); jmi_about.setActionCommand("about"); jmb_minesweeper.add(jm_help); this.setJMenuBar(jmb_minesweeper); //面板this.gamePanel = new GamePanel(); this.add(this.gamePanel); //显示this.gamePanel.setLevel(this.gamePanel.EASY); this.setSize(this.gamePanel.getWidth() + 6,this.gamePanel.getHeight() + 50); this.setVisible(true); }catch(Exception e){JOptionPane.showMessageDialog(this,"程序出现异常错误，即将退出！\r\n\r\n"+e.toString(),"提示",JOptionPane.ERROR_MESSAGE); System.exit(0); } } /*** 功能：事件监听
*/ @Override public void actionPerformed(ActionEvent e) {String command = e.getActionCommand(); if("new".equals(command)){this.gamePanel.newGame(); }else if("easy".equals(command)){this.jmi_easy.setText("√ 初级"); this.jmi_normal.setText("中级"); this.jmi_hard.setText("高级"); this.gamePanel.setLevel(this.gamePanel.EASY); this.setSize(this.gamePanel.getWidth() + 6,this.gamePanel.getHeight() + 50); }else if("normal".equals(command)){this.jmi_easy.setText("初级"); this.jmi_normal.setText("√ 中级"); this.jmi_hard.setText("高级"); this.gamePanel.setLevel(this.gamePanel.NORMAL); this.setSize(this.gamePanel.getWidth() + 6,this.gamePanel.getHeight() + 50); }else if("hard".equals(command)){this.jmi_easy.setText("初级"); this.jmi_normal.setText("中级"); this.jmi_hard.setText("√ 高级"); this.gamePanel.setLevel(this.gamePanel.HARD); this.setSize(this.gamePanel.getWidth() + 6,this.gamePanel.getHeight() + 50); }else if("exit".equals(command)){System.exit(0); }else if("about".equals(command)){JOptionPane.showMessageDialog(this,"我是小木鱼（Lag）","提示",JOptionPane.INFORMATION_MESSAGE); } } }

上面是扫雷的部分代码，游戏不是重点，重点看建立菜单和点击的代码。有时候解决问题的办法有很多，换个思路就好！
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