Java实现的动态数字时钟功能示例【显示世界时间】

本文实例讲述了java实现的动态数字时钟功能。分享给大家供大家参考，具体如下：

构建：

1. clock继承 jframe 为运行页面
2. clocktext 测试类 创建 clock 对象

运行效果：

具体实现：

一、clock类 

• 四个jpnal 三个放时间 最后一个放日期
• 放时间的三个jpnal 分别加入 地点 时间 按钮
• 最后一个按钮添加日期

具体实现如下：

public class clock extends jframe {
    private jpanel jpanelbeijing;
    private jpanel jpanelnewyork;
    private jpanel jpanellondom;
    private jpanel jpaneldate;
    private boolean beijingthreadflag_isstart = true;
    private boolean newyorkthreadflag_isstart = true;
    private boolean londonthreadflag_isstart = true;
    public clock() {
        // todo auto-generated constructor stub
        jpanelbeijing = new jpanel();
        jpanelnewyork = new jpanel();
        jpanellondom = new jpanel();
        jpaneldate = new jpanel();
        inirelations();
        inilayout();
        jframeclick();
        setvisible(true);
        setsize(480, 225);
        setlocationrelativeto(null);
    }
    private void inilayout() {
        jpanelbeijing.setlayout(new gridlayout(3, 1));
        jpanelnewyork.setlayout(new gridlayout(3, 1));
        jpanellondom.setlayout(new gridlayout(3, 1));
    }
    // 关系
    private void inirelations() {
        this.add(borderlayout.west, jpanelbeijing);
        this.add(borderlayout.center, jpanelnewyork);
        this.add(borderlayout.east, jpanellondom);
        this.add(borderlayout.south, jpaneldate);
        font placefont = new font("楷体", font.bold, 36);
        jlabel jlabelbeijing = new jlabel("北京时间");
        jlabelbeijing.setfont(placefont);
        jpanelbeijing.add(jlabelbeijing);
        setwestpanel();
        jlabel jlabelnewyork = new jlabel("纽约时间");
        jlabelnewyork.setfont(placefont);
        jpanelnewyork.add(jlabelnewyork);
        setcenterpanel();
        jlabel jlabellondon = new jlabel("伦敦时间");
        jlabellondon.setfont(placefont);
        jpanellondom.add(jlabellondon);
        seteastpanel();
        setdatepanel();
    }
    private void setwestpanel() {
        // add time for southpanel
        jlabel jlabeltime = new jlabel("加载中.");
        jlabeltime.setfont(new font("宋体", font.bold, 30));
        timer timeaction = new timer(1000, new actionlistener() {
            public void actionperformed(actionevent e) {
                long timemillis = system.currenttimemillis();
                // 转换日期显示格式
                simpledateformat time = new simpledateformat("hh:mm:ss ");
                jlabeltime.settext(time.format(new date(timemillis)));
            }
        });
        timeaction.start();
        jpanelbeijing.add(jlabeltime);
        button button = new button("北京暂停");
        button.addactionlistener(new actionlistener() {
            @override
            public void actionperformed(actionevent e) {
                // todo auto-generated method stub
                if (beijingthreadflag_isstart) {
                    timeaction.stop();
                    button.setlabel("北京继续");
                    beijingthreadflag_isstart = false;
                } else {
                    timeaction.start();
                    button.setlabel("北京暂停");
                    beijingthreadflag_isstart = true ;
                }
            }
        });
        jpanelbeijing.add(button);
    }
    private void setcenterpanel() {
        // add time for southpanel
        jlabel jlabeltime = new jlabel("加载中.");
        jlabeltime.setfont(new font("宋体", font.bold, 30));
        timer timeaction = new timer(1000, new actionlistener() {
            public void actionperformed(actionevent e) {
                long timemillis = system.currenttimemillis();
                // 转换日期显示格式
                simpledateformat time = new simpledateformat("hh:mm:ss ");
                jlabeltime.settext(time.format(new date(timemillis - 13 * 60 * 60 * 1000)));
            }
        });
        timeaction.start();
        jpanelnewyork.add(jlabeltime);
        button button = new button("纽约暂停");
        button.addactionlistener(new actionlistener() {
            @override
            public void actionperformed(actionevent e) {
                // todo auto-generated method stub
                if (newyorkthreadflag_isstart) {
                    timeaction.stop();
                    button.setlabel("纽约继续");
                    newyorkthreadflag_isstart = false;
                } else {
                    timeaction.start();
                    button.setlabel("纽约暂停");
                    newyorkthreadflag_isstart = true ;
                }
            }
        });
        jpanelnewyork.add(button);
    }
    private void seteastpanel() {
        // add time for southpanel
        // jlabel jlabeldate = new jlabel("date");
        jlabel jlabeltime = new jlabel("加载中.");
        jlabeltime.setfont(new font("宋体", font.bold, 30));
        timer timeaction = new timer(1000, new actionlistener() {
            public void actionperformed(actionevent e) {
                long timemillis = system.currenttimemillis();
                // simpledateformat date = new simpledateformat("yyyy 年 mm 月 dd
                // 日 ");
                // jlabeldate.settext(" 当前日期： " + date.format(new
                // date(timemillis)));
                simpledateformat time = new simpledateformat("hh:mm:ss ");
                jlabeltime.settext(time.format(new time(timemillis - 8 * 60 * 60 * 1000)));
            }
        });
        timeaction.start();
        jpanellondom.add(jlabeltime);
        button button = new button("伦敦暂停");
        button.addactionlistener(new actionlistener() {
            @override
            public void actionperformed(actionevent e) {
                // todo auto-generated method stub
                if (londonthreadflag_isstart) {
                    timeaction.stop();
                    button.setlabel("伦敦继续");
                    londonthreadflag_isstart = false;
                } else {
                    timeaction.start();
                    button.setlabel("伦敦暂停");
                    londonthreadflag_isstart = true ;
                }
            }
        });
        jpanellondom.add(button);
        // jpanellondom.add(jlabeldate);
    }
    private void setdatepanel() {
        // add time for southpanel
        jlabel jlabeldate = new jlabel("加载中.");
        timer timeaction = new timer(1000, new actionlistener() {
            public void actionperformed(actionevent e) {
                long timemillis = system.currenttimemillis();
                 simpledateformat date = new simpledateformat("yyyy 年 mm 月 dd 日 ");
                 jlabeldate.settext(" 当前日期： " + date.format(new date(timemillis)));
             }
        });
        timeaction.start();
        jpaneldate.add(jlabeldate);
    }
    private void jframeclick(){
        setdefaultcloseoperation(jframe.do_nothing_on_close);//设置不默认关闭
        addwindowlistener(new windowlistener() {
            @override
            public void windowopened(windowevent e) {
                // todo auto-generated method stub
            }
            @override
            public void windowiconified(windowevent e) {
                // todo auto-generated method stub
            }
            @override
            public void windowdeiconified(windowevent e) {
                // todo auto-generated method stub
            }
            @override
            public void windowdeactivated(windowevent e) {
                // todo auto-generated method stub
            }
            @override
            public void windowclosing(windowevent e) {
                // todo auto-generated method stub
                int x = joptionpane.showconfirmdialog(null, "确认退出么？", "友情提示", joptionpane.ok_cancel_option,
                        joptionpane.warning_message);
                if (x == 0) {
                    system.exit(0);
                }
            }
            @override
            public void windowclosed(windowevent e) {
                // todo auto-generated method stub
            }
            @override
            public void windowactivated(windowevent e) {
                // todo auto-generated method stub
            }
        });
    }
}

二、创建clocktext类用于测试

public class clocktext{
    public static void main(string[] args) {
        new clock();
    }
}

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：

在线世界各地时间查询：

unix时间戳(timestamp)转换工具：

在线日期/天数计算器：

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。