Java Swing - 如何使用選中的選項(xiàng)初始化JCheckBoxMenuItem...

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import java.awt.BorderLayout;
import java.awt.Cursor;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JProgressBar;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.SwingWorker;
public class Main extends JPanel {
  JButton startButton;
  JTextArea taskOutput;
  public Main() {
    super(new BorderLayout());
    JProgressBar progressBar = new JProgressBar(0, 100);
    progressBar.setValue(0);
    progressBar.setStringPainted(true);
    taskOutput = new JTextArea(5, 20);
    taskOutput.setEditable(false);
    startButton = new JButton("Start");
    startButton.setActionCommand("start");
    startButton.addActionListener(new ActionListener() {
      @Override
      public void actionPerformed(ActionEvent ae) {
 
 
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