swt 动态计时器

Question

我想用swt写个像windows xp里的扫雷程序，但是我不能实现动态计时器。我做好了布局，也写了一个mytimer类，每隔一秒返回一个字符串，如01：00，01：01……，怎么让它显示在面板的label里？ 我自己搞总是报线程访问错误，望高手指点！
package com.huan.mine;import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Menu;
import org.eclipse.swt.widgets.MenuItem;
import org.eclipse.swt.widgets.Shell;import java.util.Timer;
import java.util.TimerTask;public class AppMine {        private int showMineLength = (Constant.length + Constant.EDGE)
                        * Constant.row + Constant.SPACING * 2;        private int shellWidth = showMineLength + Constant.WIDTH;        private int shellHeight = showMineLength + Constant.HEIGHT;        /**
        * Launch the application
        * 
        * @param args
        */
        public static void main(String[] args) {
                try {
                        AppMine window = new AppMine();
                        window.open();
                } catch (Exception e) {
                        e.printStackTrace();
                }
        }        /**
        * Open the window
        */
        public void open() {
                final Display display = Display.getDefault();
                final Shell shell = new Shell(SWT.MIN | SWT.CLOSE);
                shell.setLayout(new GridLayout());
                shell.setSize(shellWidth, shellHeight);
                shell.setText("扫雷");
                shell.open();                ……
                // 计数板块 BENGIN
                class MyTimer implements Runnable {
                        private int second = 0;                        private int minute = 0;                        private Timer timer;                        private String time = null;                        private String stemp = null;                        private String mtemp = null;                        public TimerTask                        task = new TimerTask() {                                public void run() {
                                        second++;
                                        second = second % 60;
                                        minute = second / 60;                                        if (second >= 10)
                                                stemp = new Integer(second).toString();
                                        else
                                                stemp = "0" + new Integer(second).toString();                                        if (minute >= 10)
                                                mtemp = new Integer(minute).toString();
                                        else
                                                mtemp = "0" + new Integer(minute).toString();                                        time = mtemp + ":" + stemp;
                                }
                        };                        public void run() {
                                timer = new Timer();
                                timer.schedule(task, 0, 1000);                                Composite showNum = new Composite(shell, SWT.BORDER);
                                showNum.setLayoutData(new GridData(GridData.FILL_BOTH));
                                showNum.setLayout(new GridLayout(5, false));                                Label mineLabel = new Label(showNum, SWT.NONE);
                                mineLabel.setText("  " + new Integer(Constant.row).toString()
                                                + "  ");// 雷的个数                                new Label(showNum, SWT.NONE).setLayoutData(new GridData(
                                                GridData.FILL_HORIZONTAL));                                Button button = new Button(showNum, SWT.NONE);
                                button.setText("开始");                                new Label(showNum, SWT.NONE).setLayoutData(new GridData(
                                                GridData.FILL_HORIZONTAL));                                Label timeLabel = new Label(showNum, SWT.BORDER);
                                
                                timeLabel.setText(time);
                                System.out.println(time);
                                
                                try {
                                        Thread.sleep(1000);
                                } catch (InterruptedException e) {
                                        // TODO Auto-generated catch block
                                        e.printStackTrace();
                                }
                        }
                }
                Display.getCurrent().syncExec(new MyTimer());
                // timeLabel.setText(" ");
                // MyTimer.show(timeLabel);// 耗时
                // /////////////////////////////////////////////////////////
                // 计数板块 END                // 雷区板块 BENGIN
                // 雷区面板布置
                Composite showMine = new Composite(shell, SWT.BORDER);
                showMine.setLayoutData(new GridData(showMineLength, showMineLength));
                showMine.setBackground(Constant.COLOR);
                final GridLayout gridLayout = new GridLayout(Constant.row, true);
                gridLayout.verticalSpacing = 2;
                gridLayout.horizontalSpacing = 2;
                showMine.setLayout(gridLayout);                // 布雷
                Label[][] mineLabels = new Label[Constant.row][Constant.row];
                Mine[][] mines = new Mine[Constant.row][Constant.row];
                int i, j;
                for (i = 0; i < Constant.row; i++) {
                        for (j = 0; j < Constant.row; j++) {
                                mineLabels[j] = new Label(showMine, SWT.NONE);
                                mineLabels[j].setLayoutData(new GridData(Constant.length,
                                                Constant.length));
                                mines[j] = new Mine();
                        }
                }
                // 雷区板块 END                shell.layout();
                while (!shell.isDisposed()) {
                        if (!display.readAndDispatch())
                                display.sleep();
                }
        }}就是计数板块的那一段有问题，还有就是Display.getCurrent().syncExec(new MyTimer())可以显示00：01，但是不变;我用asyncExec或者是timerExec就会报错，这又是为什么，高手过来帮忙啊！！！