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); } }} |
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
