挂起和恢复的实例

import java.awt.Color;
import java.awt.event.ActionEvent;
import
java.awt.event.ActionListener;
import java.util.Date;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JButton;

public class TestSuspend{
    public static void main(String[] args){
        JFrame jf = new
JFrame(“Timer”);
        JButton pause = new
JButton(“Pause”);
        JLabel clock = new
JLabel(“Timer”);
        clock.setBackground(Color.GREEN);
        clock.setOpaque(true);
        clock.setHorizontalAlignment(JLabel.CENTER);
        jf.add(clock,”Center”);
        jf.add(pause,”North”);
        jf.setSize(140,80);
        jf.setLocation(500,300);
        jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        jf.setVisible(true);

        MyThreadnew mt = new
MyThreadnew(clock,10000);
        mt.start();
        MyListener ml = new
MyListener(clock,mt);
        pause.addActionListener(ml);
    }    
}

class MyThreadnew extends Thread{
    private JLabel clock;
    private long time;
    private long end;
    
    public MyThreadnew(JLabel
clock,long time){
        this.clock = clock;    
        this.time = time;
    }
    public void init(){
        long start = new Date().getTime();
        end = start + time;
    }    
    public void run(){
        this.init();
        while(true){
            long now = new Date().getTime();
            time = end – now;
            if(time > 0){
                String s = this.convert(time);    
                clock.setText(s);
            }else{
                break;    
            }
            try{
                Thread.sleep(10);    
            }catch(InterruptedException e){
                e.printStackTrace();    
            }
        }
        clock.setText(“时间到!”);    
        clock.setBackground(Color.RED);
    }    
    public String convert(long time){
        long h = time / 3600000;
        long m = (time % 3600000) /
60000;
        long s = (time % 60000) /
1000;
        long ms = (time % 1000) /
10;
        String ph = h<10 ? “0”:””;
        String pm = m<10 ? “0”:””;
        String ps = s<10 ? “0”:””;    
        String pms = ms<10 ? “0”:””;    
        String txt = ph + h + “:” + pm + m + “:” + ps + s + “.” + pms +
ms;
        return txt;
    }    
}

class MyListener implements ActionListener{
    private JLabel clock;
    private MyThreadnew mt;
    private boolean running= true;
    
    public MyListener(JLabel
clock,MyThreadnew mt){
        this.clock = clock;
        this.mt = mt;
    }    
    public void actionPerformed(ActionEvent e){
        if(!mt.isAlive())
            return;
        JButton jb = (JButton)(e.getSource());
        if(running){
            jb.setText(“Replay”);
            clock.setBackground(Color.YELLOW);
            mt.suspend();
        }else{
            jb.setText(“Pause”);
            clock.setBackground(Color.green);
            mt.init();
            mt.resume();
        }
        running = !running;
    }    
}