java 秒表暂停_Java/Android计时器（开始，暂停，恢复，停止）

以下是一个简单的Java计时器，包括开始，暂停，恢复和停止功能。你可以根据自己的需求进行修改。

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.Timer;

public class Stopwatch implements ActionListener {

    JFrame frame = new JFrame();
    JPanel panel = new JPanel();
    JLabel timeLabel = new JLabel();
    Timer timer = new Timer(1000, this);

    int elapsedTime = 0;
    int seconds = 0;
    int minutes = 0;
    int hours = 0;
    boolean started = false;

    String secondsString = String.format("%02d", seconds);
    String minutesString = String.format("%02d", minutes);
    String hoursString = String.format("%02d", hours);

    String time = hoursString + ":" + minutesString + ":" + secondsString;

    public Stopwatch() {

        timeLabel.setText(time);

        panel.add(timeLabel);

        frame.add(panel);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setTitle("Stopwatch");
        frame.pack();
        frame.setVisible(true);
    }

    public void start() {
        started = true;
        timer.start();
    }

    public void pause() {
        started = false;
        timer.stop();
    }

    public void resume() {
        started = true;
        timer.start();
    }

    public void reset() {
        started = false;
        timer.stop();

        elapsedTime = 0;
        seconds = 0;
        minutes = 0;
        hours = 0;

        secondsString = String.format("%02d", seconds);
        minutesString = String.format("%02d", minutes);
        hoursString = String.format("%02d", hours);

        time = hoursString + ":" + minutesString + ":" + secondsString;

        timeLabel.setText(time);
    }

    public void actionPerformed(ActionEvent e) {

        elapsedTime = elapsedTime + 1000;
        hours = (elapsedTime / 3600000);
        minutes = (elapsedTime / 60000) % 60;
        seconds = (elapsedTime / 1000) % 60;

        secondsString = String.format("%02d", seconds);
        minutesString = String.format("%02d", minutes);
        hoursString = String.format("%02d", hours);

        time = hoursString + ":" + minutesString + ":" + secondsString;

        timeLabel.setText(time);
    }

    public static void main(String[] args) {
        Stopwatch stopwatch = new Stopwatch();
        stopwatch.start();
    }

}

上面的代码创建了一个简单的图形用户界面，包括一个计时器标签和四个按钮：开始，暂停，恢复和停止。计时器标签显示经过的时间。`start()` 方法启动计时器，`pause()` 方法暂停计时器，`resume()` 方法恢复计时器，`reset()` 方法重置计时器。`actionPerformed()` 方法是计时器的核心，每秒更新计时器标签。在 `main()` 方法中，创建了一个新的 `Stopwatch` 对象，并调用 `start()` 方法开始计时器。