Java Swing - 如何擴(kuò)展SwingWorker以執(zhí)行進(jìn)度任務(wù)

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import java.awt.BorderLayout;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.util.List;
import javax.swing.JFrame;
import javax.swing.JProgressBar;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.SwingWorker;
public class Main {
  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.add(new JScrollPane(ta));
    frame.add(pb, BorderLayout.SOUTH);
    frame.pack();
    frame.setVisible(true);
    new BackgroundWorker(ta, pb).execute();
  }
}
class BackgroundWorker extends SwingWorker<Void, String> {
  private JProgressBar pb;
  private JTextArea ta;
  public BackgroundWorker(JTextArea ta, JProgressBar pb) {
 
 
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