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：
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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.zzvips.com 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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ps：这里再为大家推荐几款时间及日期相关工具供大家参考使用：
unix时间戳(timestamp)转换工具：https://tool.zzvips.com/t/timestamp/
在线秒表计时器：https://tool.zzvips.com/t/miaobiao/
希望本文所述对大家java程序设计有所帮助。
原文链接：https://blog.csdn.net/C_jian/article/details/50506759
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