本文实例讲述了Java实现的计时器【秒表】功能。分享给大家供大家参考，具体如下：

应用名称：Java计时器

用到的知识：Java GUI编程

开发环境：win8+eclipse+jdk1.8

功能说明：计时功能，精确到1毫秒，可暂停。

效果图：

源代码：

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;

/**

* 计时器

*/

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("www.jb51.net 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);

}

}

}

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希望本文所述对大家java程序设计有所帮助。