怎么写系统时间的方法

Question

我想弄一个记时器
  应该有这样一个方法吧?
 
  
   比如弄一个从起点跑到终点花费了 多少时间!!
    
     

Answer 1

参考 下文章。。研究几个 就够了。
http://hi.csdn.net/link.php?url=http://blog.csdn.net%2Flwuit

Answer 2

import javax.swing.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.*;
import java.util.Date;
import java.text.SimpleDateFormat;/**
 * 秒表功能
 * @author Administrator
 *
 */
public class StopWatch extends JFrame {
JButton btnStart, btnStop;
JLabel label;
Timer timer; public StopWatch() {
label = new JLabel("00:00:00.000");
btnStart = new JButton("start");
btnStop = new JButton("stop");
final int delay = 100;
final Date startTime = new Date();
final SimpleDateFormat sdf = new SimpleDateFormat("HH:mm:ss.S");
final Action taskPerformer = new AbstractAction() {
public void actionPerformed(ActionEvent evt) {
// 显示时间
Date d = new Date(System.currentTimeMillis()
- startTime.getTime() - 28800000);
label.setText(sdf.format(d));
label.repaint();
}
};
btnStart.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
startTime.setTime(new Date().getTime());
timer = new Timer(delay, taskPerformer);
timer.start();
}
});
btnStop.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent evt) {
if (timer != null && timer.isRunning())
timer.stop();
}
}); Container c = getContentPane();
c.add(label, BorderLayout.NORTH);
c.add(btnStart, BorderLayout.CENTER);
c.add(btnStop, BorderLayout.SOUTH);
} public static void main(String[] args) { javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
}); } private static void createAndShowGUI() {
StopWatch window = new StopWatch();
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
window.pack();
window.setVisible(true);
}
}

Answer 3

System.currentTimeMillis()//获得系统当前时间，返回的是long型整数

Answer 4

看着里...
import java.util.* ;
public class APIDemo07
{
public static void main(String args[]) throws Exception
{
Calendar calendar = new GregorianCalendar() ;
System.out.println("YEAR: " + calendar.get(Calendar.YEAR));
System.out.println("MONTH: " + (calendar.get(Calendar.MONTH)+1));
System.out.println("DAY_OF_MONTH: " + calendar.get(Calendar.DAY_OF_MONTH));
System.out.println("HOUR_OF_DAY: " + calendar.get(Calendar.HOUR_OF_DAY));
System.out.println("MINUTE: " + calendar.get(Calendar.MINUTE));
System.out.println("SECOND: " + calendar.get(Calendar.SECOND));
System.out.println("MILLISECOND: " + calendar.get(Calendar.MILLISECOND));
}
};

Answer 5

import java.util.* ; 
public class APIDemo07 
{ 
public static void main(String args[]) throws Exception 
{ 
Calendar calendar = new GregorianCalendar() ; 
System.out.println("YEAR: " + calendar.get(Calendar.YEAR)); 
System.out.println("MONTH: " + (calendar.get(Calendar.MONTH)+1)); 
System.out.println("DAY_OF_MONTH: " + calendar.get(Calendar.DAY_OF_MONTH)); 
System.out.println("HOUR_OF_DAY: " + calendar.get(Calendar.HOUR_OF_DAY)); 
System.out.println("MINUTE: " + calendar.get(Calendar.MINUTE)); 
System.out.println("SECOND: " + calendar.get(Calendar.SECOND)); 
System.out.println("MILLISECOND: " + calendar.get(Calendar.MILLISECOND)); 
} 
};