java实现秒表计时器

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于 2023-11-26 11:33:26 发布

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CC 4.0 BY-SA版权

文章标签：开发语言 java

本文链接：https://blog.youkuaiyun.com/wind89g/article/details/134625602

本文介绍了使用JavaSwing库创建一个简单的计时器Stopwatch类，包括启动、停止计时和显示时间的功能。

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import java.awt.*;
        import java.awt.event.*;
        import javax.swing.*;

public class Stopwatch implements Runnable {
    private Thread thread;
    private boolean isRunning = false;
    private long startTime;
    private long pauseTime;
    private long pauseCount;

    private JFrame frame;
    private JLabel timeLabel;
    private JButton startButton;
    private JButton stopButton;

    public Stopwatch() {
        frame = new JFrame("Stopwatch");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(300, 200);
        frame.setLayout(new BorderLayout());

        timeLabel = new JLabel("00:00:00.0", SwingConstants.CENTER);
        timeLabel.setFont(new Font("Arial", Font.PLAIN, 50));
        frame.add(timeLabel, BorderLayout.CENTER);

        startButton = new JButton("Start");
        startButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                start();
            }
        });
        frame.add(startButton, BorderLayout.NORTH);

        stopButton = new JButton("Stop");
        stopButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                stop();
            }
        });
        frame.add(stopButton, BorderLayout.SOUTH);

        frame.setVisible(true);
    }

    public void start() {
        if (!isRunning) {
            isRunning = true;
            startTime = System.currentTimeMillis();
            thread = new Thread(this);
            thread.start();
        }
    }

    public void stop() {
        if (isRunning) {
            isRunning = false;
            pauseTime = System.currentTimeMillis();
            pauseCount += (pauseTime - startTime);
        }
    }

    public void run() {
        while (isRunning) {
            long elapsedTime = System.currentTimeMillis() - startTime - pauseCount;
            int hours = (int) (elapsedTime / 3600000);
            int minutes = (int) ((elapsedTime - hours * 3600000) / 60000);
            int seconds = (int) ((elapsedTime - hours * 3600000 - minutes * 60000) / 1000);
            int tenths = (int) ((elapsedTime - hours * 3600000 - minutes * 60000 - seconds * 1000) / 100);
            timeLabel.setText(String.format("%02d:%02d:%02d.%d", hours, minutes, seconds, tenths));
            try {
                Thread.sleep(100);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    public static void main(String[] args) {
        new Stopwatch();
    }
}