java秒表计时器显示_Java实现的计时器【秒表】功能示例

以下是Java实现秒表计时器的示例代码：

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

public class Stopwatch implements ActionListener {

    private JFrame frame;
    private JLabel timeLabel;
    private JButton startButton, stopButton, resetButton;
    private Timer timer;

    private int elapsedTime;
    private int seconds;
    private int minutes;
    private int hours;
    private boolean started;

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

        timeLabel = new JLabel("00:00:00", JLabel.CENTER);

        startButton = new JButton("Start");
        stopButton = new JButton("Stop");
        resetButton = new JButton("Reset");

        startButton.addActionListener(this);
        stopButton.addActionListener(this);
        resetButton.addActionListener(this);

        timer = new Timer(1000, new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                elapsedTime += 1000;
                updateTimer();
            }
        });

        JPanel panel = new JPanel(new GridLayout(2, 1));
        JPanel topPanel = new JPanel(new GridLayout(1, 1));
        JPanel bottomPanel = new JPanel(new GridLayout(1, 3));

        topPanel.add(timeLabel);

        bottomPanel.add(startButton);
        bottomPanel.add(stopButton);
        bottomPanel.add(resetButton);

        panel.add(topPanel);
        panel.add(bottomPanel);

        frame.add(panel);

        frame.setVisible(true);
    }

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

    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == startButton) {
            start();
        } else if (e.getSource() == stopButton) {
            stop();
        } else if (e.getSource() == resetButton) {
            reset();
        }
    }

    private void start() {
        if (!started) {
            started = true;
            timer.start();
        }
    }

    private void stop() {
        if (started) {
            started = false;
            timer.stop();
        }
    }

    private void reset() {
        started = false;
        timer.stop();
        elapsedTime = 0;
        seconds = 0;
        minutes = 0;
        hours = 0;
        updateTimer();
    }

    private void updateTimer() {
        seconds = (elapsedTime / 1000) % 60;
        minutes = (elapsedTime / 60000) % 60;
        hours = (elapsedTime / 3600000) % 24;

        String secondsStr = String.format("%02d", seconds);
        String minutesStr = String.format("%02d", minutes);
        String hoursStr = String.format("%02d", hours);

        timeLabel.setText(hoursStr + ":" + minutesStr + ":" + secondsStr);
    }
}

这个示例代码实现了一个基本的秒表计时器功能，包括开始、停止和重置功能。它使用了Java Swing中的JFrame、JLabel、JButton和JPanel组件，以及Timer类来实现计时器的功能。当用户点击开始按钮时，计时器会开始计时；当用户点击停止按钮时，计时器会停止计时；当用户点击重置按钮时，计时器会重置为0。计时器的显示格式为：小时:分钟:秒钟。