Java实现的动态数字时钟功能示例【显示世界时间】

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
            }
        });
    }
}

public class ClockText{
    public static void main(String[] args) {
        new Clock();
    }
}