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package test;
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import java.util.*;
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
public class Test5 extends Applet {
private final Panel pan = new Panel();
private final Label time = new Label();
private final Button btnGo = new Button("开始");
private final Button btnPouse = new Button("暂停");
private final Button btnReset = new Button("复位");
private final StopwatchThread swThread = new StopwatchThread();
private class btnGoListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
swThread.go();
btnGo.setEnabled(false);
}
}
private class btnPouseListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
if(btnGo.isEnabled()){
return ;
}
if (btnPouse.getLabel().equals("继续")) {
swThread.go();
btnPouse.setLabel("暂停");
} else if (btnPouse.getLabel().equals("暂停")) {
swThread.noGo();
btnPouse.setLabel("继续");
}
}
}
private class btnResetListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
swThread.reset();
btnGo.setEnabled(true);
btnGo.setLabel("开始");
btnPouse.setLabel("暂停");
}
}
private class StopwatchThread extends Thread {
private boolean going = false;
private long prevElapsed = 0;
private Date startDate = new Date();
private long elapsedTime() {
return prevElapsed +
(going ? new Date().getTime() - startDate.getTime() : 0);
}
private String msToString(long time) {
System.out.println(time+" "+((0*60+2)*1000+999));
if(((99*60+59)*1000+983)=time((99*60+59)*1000+999)=time){//((0*60+2)*1000+983)=time((0*60+2)*1000+999)=time
if (time % 1000 990)
time += 2;
swThread.noGo();
}
String ms, sec, min;
if (time % 10 = 5)
time += 5;
ms = Long.toString(time % 1000);
while (ms.length() 3)
ms = "0" + ms;
ms = ms.substring(0, ms.length() - 1);
time /= 1000;
sec = Long.toString(time % 60);
if (sec.length() == 1) sec = "0" + sec;
time /= 60;
min = Long.toString(time);
return min + ":" + sec + "." + ms;
}
public void go() {
startDate = new Date();
going = true;
}
public void noGo() {
prevElapsed = elapsedTime();
going = false;
}
public void reset() {
going = false;
prevElapsed = 0;
}
public void run() {
while (true) {
time.setText(msToString(elapsedTime()));
yield();
}
}
}
public void init() {
setLayout(new GridLayout(2,2));
setBackground(Color.lightGray);
setForeground(Color.black);
pan.setLayout(new GridLayout(3,2));
pan.add(new Label("计时:"));
time.setForeground(Color.blue);
pan.add(time);
pan.add(btnGo);
pan.add(btnPouse);
pan.add(btnReset);
pan.add(new Label());
add(pan);
btnGo.addActionListener(new btnGoListener());
btnReset.addActionListener(new btnResetListener());
btnPouse.addActionListener(new btnPouseListener());
swThread.setDaemon(true);
swThread.start();
}
public static void main(String[] args) {
Test5 applet = new Test5();
Frame aFrame = new Frame("计时器");
aFrame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
aFrame.add(applet, BorderLayout.CENTER);
aFrame.setSize(400, 200);
applet.init();
applet.start();
aFrame.setVisible(true);
}
}
可以改变有注释的那个if语句里面的值来判断什么时候停止
你可以在开始和结束的时候，分别记录下当前的时间的这毫秒数。然后再减，以下是一段代码。
public class Test{
public static void main(String[] args) {
long startMili=System.currentTimeMillis();// 当前时间对应的毫秒数
System.out.println("开始 "+startMili);
// 执行一段代码,求一百万次随机值
for(int i=0;i1000000;i++){
Math.random();
}
long endMili=System.currentTimeMillis();
System.out.println("结束 s"+endMili);
System.out.println("总耗时为："+(endMili-startMili)+"毫秒");
}
}
package demo;
import javax.swing.*;
import java.awt.HeadlessException;
import java.awt.BorderLayout;
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class Timer extends JFrame {
private static final long serialVersionUID = 1L;
private static final String INITIAL_LABEL_TEXT = "00:00:00 000";
// 计数线程
private CountingThread thread = new CountingThread();
// 记录程序开始时间
private long programStart = System.currentTimeMillis();
// 程序一开始就是暂停的
private long pauseStart = programStart;
// 程序暂停的总时间
private long pauseCount = 0;
private JLabel label = new JLabel(INITIAL_LABEL_TEXT);
private JButton startPauseButton = new JButton("开始");
private JButton resetButton = new JButton("清零");
private ActionListener startPauseButtonListener = new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (thread.stopped) {
pauseCount += (System.currentTimeMillis() - pauseStart);
thread.stopped = false;
startPauseButton.setText("暂停");
} else {
pauseStart = System.currentTimeMillis();
thread.stopped = true;
startPauseButton.setText("继续");
}
}
};
private ActionListener resetButtonListener = new ActionListener() {
public void actionPerformed(ActionEvent e) {
pauseStart = programStart;
pauseCount = 0;
thread.stopped = true;
label.setText(INITIAL_LABEL_TEXT);
startPauseButton.setText("开始");
}
};
public Timer(String title) throws HeadlessException {
super(title);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setLocation(300, 300);
setResizable(false);
setupBorder();
setupLabel();
setupButtonsPanel();
startPauseButton.addActionListener(startPauseButtonListener);
resetButton.addActionListener(resetButtonListener);
thread.start(); // 计数线程一直就运行着
}
// 为窗体面板添加边框
private void setupBorder() {
JPanel contentPane = new JPanel(new BorderLayout());
contentPane.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5));
this.setContentPane(contentPane);
}
// 配置按钮
private void setupButtonsPanel() {
JPanel panel = new JPanel(new FlowLayout());
panel.add(startPauseButton);
panel.add(resetButton);
add(panel, BorderLayout.SOUTH);
}
// 配置标签
private void setupLabel() {
label.setHorizontalAlignment(SwingConstants.CENTER);
label.setFont(new Font(label.getFont().getName(), label.getFont().getStyle(), 40));
this.add(label, BorderLayout.CENTER);
}
// 程序入口
public static void main(String[] args) {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception e) {
e.printStackTrace();
}
Timer frame = new Timer("计时器");
frame.pack();
frame.setVisible(true);
}
private class CountingThread extends Thread {
public boolean stopped = true;
private CountingThread() {
setDaemon(true);
}
@Override
public void run() {
while (true) {
if (!stopped) {
long elapsed = System.currentTimeMillis() - programStart - pauseCount;
label.setText(format(elapsed));
}
try {
sleep(1); // 1毫秒更新一次显示
} catch (InterruptedException e) {
e.printStackTrace();
System.exit(1);
}
}
}
// 将毫秒数格式化
private String format(long elapsed) {
int hour, minute, second, milli;
milli = (int) (elapsed % 1000);
elapsed = elapsed / 1000;
second = (int) (elapsed % 60);
elapsed = elapsed / 60;
minute = (int) (elapsed % 60);
elapsed = elapsed / 60;
hour = (int) (elapsed % 60);
return String.format("%02d:%02d:%02d %03d", hour, minute, second, milli);
}
}
}
你可以试试，希望能帮到你！
import java.awt.BorderLayout;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class TimeCount extends JFrame implements ActionListener{
ThreadCount tc=new ThreadCount(this);
Thread thread=new Thread(tc);
JPanel panelN=new JPanel(),panelC=new JPanel();
JLabel label=new JLabel("计时器");
JButton butnStart=new JButton("开始");
boolean toEnd;
public TimeCount() {
setBounds(100,100,300,300);
setVisible(true);
label.setFont(new Font(null,Font.BOLD,22));
panelN.add(label);
add(panelN,BorderLayout.NORTH);
panelC.add(butnStart);
add(panelC,BorderLayout.CENTER);
butnStart.addActionListener(this);
validate();
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public void actionPerformed(ActionEvent arg0) {
if(arg0.getSource()==butnStart){
if(!thread.isAlive()){
thread=new Thread(tc);
thread.start();
}else {
toEnd=true;
}
}
}
public static void main(String[] args) {
new TimeCount();
}
}
class ThreadCount implements Runnable{
TimeCount lc;
public ThreadCount(TimeCount lc) {
super();
this.lc = lc;
}
public void run() {
int i=1;
while(true){
if(lc.toEnd){
lc.toEnd=false;
lc.butnStart.setText("开始");
return;
}
try {
Thread.sleep(2);
} catch (InterruptedException e) {
// TODO: handle exception
}
i+=2;
int min=i/60000;
int second=(i%60000)/1000;
int mm=i%1000;
String show="";
if(min0)
show+=min+":";
if(second0)
show+=second+".";
show+=mm;
lc.label.setText(show);
}
}
}
满意请采纳。
import java.io.IOException;
import java.util.Timer;
public class TimerTest {
public static void main(String[] args) {
Timer timer = new Timer();
timer.schedule(new MyTask(), 1000, 2000);// 在1秒后执行此任务,每次间隔2秒,如果传递一个Data参数,就可以在某个固定的时间执行这个任务.
while (true) {// 这个是用来停止此任务的,否则就一直循环执行此任务了
try {
int ch = System.in.read();
if (ch - 'c' == 0) {
timer.cancel();// 使用这个方法退出任务
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
static class MyTask extends java.util.TimerTask {
@Override
public void run() {
// TODO Auto-generated method stub
System.out.println("________");
}
}
}
这段代码基本能满足你需求了 你还有需求就在上面再套一层job 当然如过太复杂了而且这种定时需求很多的话 建议用quartz框架 使用很简单
计时器可以使用timer类也可以使用线程类来操作，下面是Thread做的简单的计时器
public class Calculagraph extends Thread {
public static void main(String[] args) {
new Calculagraph().start();
}
private long now = 0l;
private long start = System.currentTimeMillis();// 程序启动时间的毫秒值
private long time;
public void run() {
while (true) {
now = System.currentTimeMillis();// 获取一秒之后的毫秒值
time = now - start;// 两个时间相减的到毫秒差
System.out.format("%02d:%02d:%02d\n",
time / (1000 * 60 * 60) % 60/* 时 */,
time / (1000 * 60)% 60/* 分 */,
time / 1000 % 60/* 秒 */);// 格式化字符串输出
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}