Java Swing - 如何在Swing線程中更新JProgressBar

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import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JProgressBar;
import javax.swing.SwingUtilities;
public class Main extends JPanel {
  JProgressBar pbar;
  static int min = 0;
  static int max = 100;
  public Main() {
    pbar = new JProgressBar();
    pbar.setMinimum(min);
    pbar.setMaximum(max);
    add(pbar);
    
    JFrame frame = new JFrame("Progress Bar Example");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setContentPane(this);
    frame.pack();
    frame.setVisible(true);
    for (int i = min; i <= max; i++) {
      final int percent = i;
      try {
        SwingUtilities.invokeLater(new Runnable() {
          public void run() {
            updateBar(percent);
          }
 
 
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