本文實例講述了java實現的計時器【秒表】功能。分享給大家供大家參考，具體如下：
應用名稱：java計時器
用到的知識：java gui編程
開發環境：win8+eclipse+jdk1.8
功能說明：計時功能，精確到1毫秒，可暫停。
效果圖：
源代碼：
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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;/** * 計時器 */public class timer extends jframe { /** * */ private static final long serialversionuid = 1l; private static final string initial_label_text = "00:00:00 000"; // 計數線程 private countingthread thread = new countingthread(); // 記錄程序開始時間 private long programstart = system.currenttimemillis(); // 程序一開始就是暫停的 private long pausestart = programstart; // 程序暫停的總時間 private long pausecount = 0; private jlabel label = new jlabel(initial_label_text); private jbutton startpausebutton = new jbutton("開始"); 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("暫停"); } else { pausestart = system.currenttimemillis(); thread.stopped = true; startpausebutton.settext("繼續"); } } }; private actionlistener resetbuttonlistener = new actionlistener() { public void actionperformed(actionevent e) { pausestart = programstart; pausecount = 0; thread.stopped = true; label.settext(initial_label_text); startpausebutton.settext("開始"); } }; 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(); // 計數線程一直就運行著 } // 為窗體面板添加邊框 private void setupborder() { jpanel contentpane = new jpanel(new borderlayout()); contentpane.setborder(borderfactory.createemptyborder(5, 5, 5, 5)); this.setcontentpane(contentpane); } // 配置按鈕 private void setupbuttonspanel() { jpanel panel = new jpanel(new flowlayout()); panel.add(startpausebutton); panel.add(resetbutton); add(panel, borderlayout.south); } // 配置標簽 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.jfrwli.cn 計時器"); 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毫秒更新一次顯示 } catch (interruptedexception e) { e.printstacktrace(); system.exit(1); } } } // 將毫秒數格式化 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：這里再為大家推薦幾款時間及日期相關工具供大家參考使用：
unix時間戳(timestamp)轉換工具：https://tool.zzvips.com/t/timestamp/
在線秒表計時器：https://tool.zzvips.com/t/miaobiao/
希望本文所述對大家java程序設計有所幫助。
原文鏈接：https://blog.csdn.net/C_jian/article/details/50506759
