主方法完成后的Swing计时器持久性

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

public class TimerExample {
    private JLabel label;
    private Timer timer;
    private int count = 0;

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

        JPanel panel = new JPanel();
        label = new JLabel("Time: " + count);
        panel.add(label);

        frame.getContentPane().add(panel);
        frame.setVisible(true);

        // 创建计时器，每1000毫秒（1秒）执行一次任务
        timer = new Timer(1000, new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                count++;
                label.setText("Time: " + count);
            }
        });
        timer.start();
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new TimerExample();
            }
        });

        // 主方法完成后，计时器仍然可以继续运行
        System.out.println("Main method completed.");
    }
}