怎么用Java实现精确到毫秒的倒计时器

Question

现在要用Java实现一个倒计时器，我采用的办法是：先获得总的毫秒数matchTime，然后用Timer，每隔一毫秒就让matchTime减1，然后再把matchTime转换成时间的格式。但是这样做出来的时间走的比现实时间要慢得多，如果改成每100秒减100次，就和现实时间差不多了，这也就是说精确到了0.1秒。但是有没有办法精确到毫秒呢？

Answer 1

此回复为自动发出,仅用于显示而已，并无任何其他特殊作用
楼主【yugang1219】截止到2008-07-28 13:46:32的历史汇总数据(不包括此帖)：
发帖的总数量:11                       发帖的总分数:420                      每贴平均分数:38                       
回帖的总数量:56                       得分贴总数量:17                       回帖的得分率:30%                      
结贴的总数量:8                        结贴的总分数:310                      
无满意结贴数:0                        无满意结贴分:0                        
未结的帖子数:3                        未结的总分数:110                      
结贴的百分比:72.73 %               结分的百分比:73.81 %                  
无满意结贴率:0.00  %               无满意结分率:0.00  %                  
楼主加油

Answer 2

getMilliseconds（），返回毫秒数。

Answer 3

windows系统的计时精确度在15毫秒左右。

Answer 4

import java.util.Date;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.awt.Font;
import java.awt.BorderLayout;
import java.awt.event.MouseEvent;
import java.awt.event.MouseAdapter;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingConstants;/**
 * TimerFrame - 倒计时窗口
 * @author SageZk
 * @version 1.0
 */
@SuppressWarnings("serial")
public class TimerFrame extends JFrame { private long time = (long) (1.2 * 60 * 1000L);  //倒计时时间（单位毫秒）
private JLabel lblTime;
private Thread runner; public TimerFrame() {
super("TimerFrame");
this.lblTime = new JLabel("单击开始");
this.lblTime.setFont(new Font("Monospaced", Font.BOLD, 60));
this.lblTime.setHorizontalAlignment(SwingConstants.CENTER);
this.lblTime.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
if (runner != null) runner.start();
}
});
this.runner = new Thread(new Runnable() {
public void run() {
Date t = new Date();
StringWriter sw = new StringWriter();
StringBuffer sb = sw.getBuffer();
PrintWriter pw = new PrintWriter(sw);
long cur = 0L, end = System.currentTimeMillis() + time;
while ((cur = end - System.currentTimeMillis()) > 0) {
t.setTime(cur);
pw.format("%1$tM:%1$tS.%tL", t);
pw.flush();
lblTime.setText(sb.toString());
sb.setLength(0);
try {
Thread.sleep(6L);
} catch (InterruptedException e) {
}
}
lblTime.setText("00:00.000");
try {
Thread.sleep(1200L);
} catch (InterruptedException e) {
}
lblTime.setText("Bomb!!!");
}
});
this.runner.setDaemon(true);
getContentPane().add(this.lblTime, BorderLayout.CENTER);
setResizable(false);
setBounds(0, 0, 460, 330);
setLocationRelativeTo(null);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
} public static void main(String[] args) {
new TimerFrame().setVisible(true);
}}

Answer 5

import java.util.Date;
import java.io.PrintWriter;
import java.awt.Font;
import java.swing.JFrame;
 public TimerFrame() {
        super("TimerFrame");
        this.lblTime = new JLabel("单击开始");
        this.lblTime.setFont(new Font("Monospaced", Font.BOLD, 60));
        this.lblTime.setHorizontalAlignment(SwingConstants.CENTER);
        this.lblTime.addMouseListener(new MouseAdapter() {
            public void mouseClicked(MouseEvent e) {
                if (runner != null) runner.start();
            }
        });
this.runner = new Thread(new Runnable() {
            public void run() {
                Date t = new Date();
                StringWriter sw = new StringWriter();
                StringBuffer sb = sw.getBuffer();
                PrintWriter pw = new PrintWriter(sw);
                long cur = 0L, end = System.currentTimeMillis() + time;
                while ((cur = end - System.currentTimeMillis()) > 0) {
                    t.setTime(cur);
                    pw.format("%1$tM:%1$tS.%tL", t);
                    pw.flush();
                    lblTime.setText(sb.toString());
                    sb.setLength(0);
                    try {
                        Thread.sleep(6L);
                    } catch (InterruptedException e) {
                    }
                }
                lblTime.setText("00:00.000");
                try {
                    Thread.sleep(1200L);
                } catch (InterruptedException e) {
                }
                lblTime.setText("Bomb!!!");
            }
        });
        this.runner.setDaemon(true);
        getContentPane().add(this.lblTime, BorderLayout.CENTER);
        setResizable(false);
        setBounds(0, 0, 460, 330);
        setLocationRelativeTo(null);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }    public static void main(String[] args) {
        new TimerFrame().setVisible(true);
    }}

Answer 6

8楼的 Copy 我代码也不贴全，你那能通过编译吗？

Answer 7

用Timer 不就行了，quartz 也可以。

Answer 8

this.runner = new Thread(new Runnable() { 
            public void run() { 
                Date t = new Date(); 
                StringWriter sw = new StringWriter(); 
                StringBuffer sb = sw.getBuffer(); 
                PrintWriter pw = new PrintWriter(sw); 
                long cur = 0L, end = System.currentTimeMillis() + time; 
                while ((cur = end - System.currentTimeMillis()) > 0) { 
                    t.setTime(cur); 
                    pw.format("%1$tM:%1$tS.%tL", t); 
                    pw.flush(); 
                    lblTime.setText(sb.toString()); 
                    sb.setLength(0); 
                    try { 
                        Thread.sleep(6L); 
                    } catch (InterruptedException e) { 
                    } 
                } 
                lblTime.setText("00:00.000"); 
                try { 
                    Thread.sleep(1200L); 
                } catch (InterruptedException e) { 
                } 
                lblTime.setText("Bomb!!!"); 
            } 
        }); 
        this.runner.setDaemon(true); 

Answer 9

估计毫秒级，应该不好实现。我的机器，所有线程轮一圈，大概10毫秒。
所以，一旦程序中出现sleep，那么下次执行的毫秒数很有可能会滞后（每次最多10毫秒）。JDK1.5当中的Timer类。楼主可以去看看。如果应用简单的话。应该能够达到要求。