Java实现的计时器【秒表】功能示例

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);
    }
  }
}

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：

在线日期/天数计算器：

在线日期计算器/相差天数计算器：

在线日期天数差计算器：

更多关于java相关内容感兴趣的读者可查看本站专题：《java日期与时间操作技巧汇总》、《java数据结构与算法教程》、《java操作dom节点技巧总结》和《java缓存操作技巧汇总》

希望本文所述对大家java程序设计有所帮助。