JAVA需要一条秒表计时器代码

好吧，已看到你的评论,我在这里再回答一次：

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1）你所说的置顶如果是属于悬浮窗效果，那么JFrame实例化后，再添加一行如下的代码：

form1.setAlwaysOnTop(true);// 总是允许窗口置顶

2)时分秒更简单了，除一除转转换就行了，没有技术含量。

3)快捷键通过JButton类的setMnemonic方法实现

So,综上，整个程序的实现算法如下：

package hky.example;

import java.awt.BorderLayout;

import java.awt.Container;

import java.awt.GridLayout;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.KeyEvent;

import java.awt.event.WindowEvent;

import java.awt.event.WindowListener;

import java.io.*;

import java.util.*;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JOptionPane;

import javax.swing.JPanel;

import javax.swing.JTextField;

import javax.swing.plaf.OptionPaneUI;

public class Demo{

static boolean isRuning=false;

static boolean isFirst=true;

static Integer hmsCounter=0;

static int hour,minute,second;

@SuppressWarnings("unchecked")

public static void main(String[] args) throws Exception {

JFrame form1 = new JFrame("Form1");

form1.setAlwaysOnTop(true);// 1)总是允许窗口置顶

JTextField jTextField = new JTextField(10);

jTextField.setSize(10, 10);

jTextField.setText("0");

jTextField.setEditable(false);

JButton jButton = new JButton("开始");

jButton.setSize(10, 10);

Thread thread = new Thread(new Runnable() {

@Override

public void run() {

while (true) {

while(isRuning){

++hmsCounter; 

//3)时分秒显示

hour=hmsCounter/3600;

minute=hmsCounter%3600/60;

second=hmsCounter%60;

jTextField.setText(hour+"时"+minute+"分"+second+"秒");

try {Thread.sleep(1000);} catch (Exception e2) {}

}

try {Thread.sleep(200);} catch (Exception e2) {}// 修复上一次回答的版本可能会存在的Bug

}

}

});

jButton.setMnemonic(KeyEvent.VK_ENTER);// 2)给JButton发送 Alt+Enter快捷键

jButton.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

String text=jButton.getText().equals("开始")?"暂停":"开始";

jButton.setText(text);

isRuning=!isRuning;

if(isFirst){

thread.start();

isFirst=false;

}

}

});

JPanel panel = new JPanel();

panel.setSize(200, 200);

panel.add(jTextField, BorderLayout.NORTH);

panel.add(jButton, BorderLayout.CENTER);

form1.add(panel);

form1.setBounds(200, 100, 250, 150);

form1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

form1.addWindowListener(new WindowListener() {

@Override

public void windowOpened(WindowEvent e) {

// TODO Auto-generated method stub

}

@Override

public void windowIconified(WindowEvent e) {

// TODO Auto-generated method stub

}

@Override

public void windowDeiconified(WindowEvent e) {

// TODO Auto-generated method stub

}

@Override

public void windowDeactivated(WindowEvent e) {

// TODO Auto-generated method stub

}

@Override

public void windowClosing(WindowEvent e) {

// 窗口关闭前取出文本框的数字保存到外部文件，代码在此处写

JOptionPane.showMessageDialog(null, "Are you sure closing?");

}

@Override

public void windowClosed(WindowEvent e) {

// TODO Auto-generated method stub

}

@Override

public void windowActivated(WindowEvent e) {

// TODO Auto-generated method stub

}

});

form1.setVisible(true);

}

}

写一个计时器 JAVA代码是什么？

应该用线程里面的Timer来控制package com.sy.game.test;

import java.util.Timer;

import java.util.TimerTask;

public class TimeTask {

public static void main(String[] args) {

TimeTask tTask=new TimeTask();

tTask.timeVoid();

}

public void timeVoid(){

final Timer timer = new Timer();

TimerTask tt=new TimerTask() {

@Override

public void run() {

System.out.println("到点啦!");

timer.cancel();

}

};

timer.schedule(tt, 3000);

}

}

整合的：

/*

* java倒计时器

* shiyang

* */

package com.sy.game.test;

import java.awt.Container;

import java.awt.FlowLayout;

import java.awt.Toolkit;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.JTextField;

import javax.swing.Timer;

@SuppressWarnings("unused")

public class TimeController extends JFrame implements ActionListener {

private static final long serialVersionUID = 4603262282860990473L;

private static final int DEFAULT_WIDTH = 200;

private static final int DEFAULT_HEIGHT = 100;

private static final int width = Toolkit.getDefaultToolkit()

.getScreenSize().width;

private static final int height = Toolkit.getDefaultToolkit()

.getScreenSize().height;

private Container container;

private JButton btn;

private JTextField jtfTime;

private Timer tmr;

public TimeController() {

initComponents();

Timer tmr = new Timer(1000, this);

this.tmr = tmr;

setVisible(true);

}

private void initComponents() {

this.setTitle("SY秒表");

this.setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

this.setResizable(false);

setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

this.setLocation((width - DEFAULT_WIDTH) / 2,

(height - DEFAULT_HEIGHT) / 2);

jtfTime = new JTextField("10");

btn = new JButton("开始倒计时");

container = getContentPane();

JPanel panel = new JPanel();

panel.add(btn);

panel.add(jtfTime);

this.add(panel);

btn.addActionListener(this);

}

public void actionPerformed(ActionEvent ae) {

if (ae.getSource() == btn) {

jtfTime.setText("10");

tmr.start();

} else {

int t;

t = Integer.parseInt(jtfTime.getText());

t--;

jtfTime.setText("" + t);

if (t = 0) {

tmr.stop();

}

}

}

public static void main(String[] args) {

TimeController timeController = new TimeController();

}

}

Java 秒表

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！

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