我尽力了,只能请求大家帮忙.我没有积分了,如果只为积分来的,那就别进了

问题有以下两个
1.如何将时间显示出来,而且是倒计时的...

2.当我连续多次点击菜单栏"重新游戏"或者"开始新游戏",那么游戏时间到达后,它会弹出多个如下代码所示的框

JOptionPane.showMessageDialog(MainFrame.this, "时间到了!!");

int result = JOptionPane.showConfirmDialog(MainFrame.this,
"重玩一次?", "Again",
JOptionPane.YES_NO_CANCEL_OPTION);

而不是一个,我尽力了,只能请求大家帮忙.
会出现这样的结果我估计是重载游戏时,没有将Timer.stop（）.无论我如何调试都是这种问题


代码如下:

import java.awt.BorderLayout;
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.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.Timer;

import cn.elva.Settings;
import cn.elva.model.Map;

public class MainFrame extends JFrame
{

private static final long serialVersionUID = 1L;

//炸弹的次数
private int bombCount = Settings.BOMBCOUNT;

private JPanel jContentPane = null;

private JMenuBar menuBar = null;

private JMenu fileMenu = null;

private JMenuItem reloadItem = null;

private JMenuItem startItem = null;
//炸弹
private JMenuItem bombItem = null;

private JMenuItem exitItem = null;

private MapUI mapUI = null;
// 游戏开始时间
private long startTime;

// 结束时间
private long endTime;

private Timer timer = null;

// private JMenuItem ti
private JMenuBar initMenuBar()
{
if (menuBar == null)
{
menuBar = new JMenuBar();
fileMenu = new JMenu("文件");

startItem = new JMenuItem("开始游戏");
startItem.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
reload();
}
});
reloadItem = new JMenuItem("重来一次");
reloadItem.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
reload();
}
});

bombItem = new JMenuItem("炸弹");
bombItem.addActionListener(new ActionListener(){
public void actionPerformed( ActionEvent e )
{
if( bombCount==0 )
{
JOptionPane.showMessageDialog(MainFrame.this,"你已经没有炸弹可用了!!!" );
bombItem.setEnabled(false);
return;
}
mapUI.bomb();
bombCount--;
}
});
exitItem = new JMenuItem("退出");
exitItem.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
System.exit(0);
}
});

fileMenu.add(startItem);
fileMenu.add(reloadItem);
fileMenu.add( bombItem );
fileMenu.add(exitItem);
menuBar.add(fileMenu);
}

return menuBar;
}

/**
* @param args
*/
public static void main(String[] args)
{
// PAN_TODO 自动生成方法存根
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
MainFrame thisClass = new MainFrame();
thisClass.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
thisClass.setVisible(true);
}
});
}

/**
* This is the default constructor
*/
public MainFrame()
{
super();
initialize();
}

/**
* This method initializes this
*
* @return void
*/
private void initialize()
{
this.setSize(900, 900);
this.setTitle("llk");
this.setJMenuBar(initMenuBar());
// this.setContentPane(getJContentPane());
this.setTitle("连连看");
}

private void reload()
{
mapUI = new MapUI();
startTime = System.currentTimeMillis() / 1000;

endTime = startTime + Settings.PERTIME;

// jContentPane.setVisible(true);
jContentPane = new JPanel();
jContentPane.setLayout(new BorderLayout());
jContentPane.add(mapUI);

this.setContentPane(jContentPane);
this.validate();
Map.LEFTCOUNT = Settings.ROWS * Settings.COLUMNS;
initTimer();

bombItem.setEnabled(true);
bombCount=Settings.BOMBCOUNT;
}

private void initTimer()
{
ActionListener actionListener = new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
startTime = System.currentTimeMillis() / 1000;

if (startTime == endTime)
{
JOptionPane.showMessageDialog(MainFrame.this, "时间到了!!");
int result = JOptionPane.showConfirmDialog(MainFrame.this,
"重玩一次?", "Again", JOptionPane.YES_NO_CANCEL_OPTION);
if (result == JOptionPane.YES_OPTION)
{
reload();
}
else
{
jContentPane.setVisible(false);
validate();
}
}
}
};
timer = new javax.swing.Timer(500, actionListener);
timer.start();
}
}