Java Swing - 如何使用SwingWorker来处理冗长的任务...

import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.JFrame;
import javax.swing.JProgressBar;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.Timer;

public class Main {
  static int index = 0;

  public static void main(String[] args) {
    JProgressBar pb = new JProgressBar();
    JTextArea ta = new JTextArea(10, 20);

    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setLayout(new BorderLayout());
    frame.add(new JScrollPane(ta));
    frame.add(pb, BorderLayout.SOUTH);
    frame.pack();
    frame.setVisible(true);

    Timer timer = new Timer(250, new ActionListener() {
      @Override
      public void actionPerformed(ActionEvent e) {
        index++;
        if (index >= 100) {
          ((Timer) (e.getSource())).stop();
        }
        ta.append("Line " + index + "\n");
        pb.setValue(index);
      }
    });
    timer.setRepeats(true);
    timer.setCoalesce(true);
    timer.start();
  }
}