在 Java 中执行长时间运行的任务时，SwingWorker 如何防止阻塞事件分发线程？

// **illustrates previous example**
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.SwingWorker;

public class SwingWorkerExample {

    private static void main(String[] args) {
        // Initialize GUI
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JPanel panel = new JPanel();
        panel.setLayout(new FlowLayout());

        // Create and add a button to trigger the SwingWorker
        JButton button = new JButton("Start Async Task");
        panel.add(button);
        f.add(panel);
        f.pack();
        f.setVisible(true);

        // SwingWorker to perform the task
        SwingWorker<Integer, Void> worker = new SwingWorker<Integer, Void>() {

            // executed on a background thread:
            @Override
            protected Integer doInBackground() throws Exception {
                // simulate a heavy task:
                Thread.sleep(3000); // replace with actual code...
                return 42; // return an integer result...
            }

            // executed on the EDT after doInBackground completes:
            @Override
            protected void done() {
                try {
                    // get the result of the SwingWorker:
                    int result = get();
                } catch (Exception ex) {
                    ex.printStackTrace();
                }
            }
        };

        // ActionListener for the button:
        button.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                // start the SwingWorker when the button is clicked:
                worker.execute();
            }
        });
    }
}