计时器程序

不念不忘少年蓝@ 2021-12-16 06:19 311阅读 0赞

package MYDemo;
    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 MainFrame 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 MainFrame(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();  
            }  
       
            MainFrame frame = new MainFrame("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);  
            }  
        }  
    }

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[20190705112236614.png]: /images/20211214/f22904e7732848b0bfd72b91d3f37322.png