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Java Swing - 如何詢問用戶是否想通過JOptionPane退出

我們想知道如何詢問用戶是否想通過JOptionPane退出。 
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JFrame;
import javax.swing.JOptionPane;

public class Main extends JFrame {
  public Main() {
    setSize(200, 200);
    setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
    addWindowListener(new WindowAdapter() {
      @Override
      public void windowClosing(WindowEvent evt) {
        Object[] options = { "Quit, My Computing Fellow",
            "No, I want to Work more" };

        int answer = JOptionPane.showOptionDialog(Main.this,
            "What would you like to do? ", "Quit:Continue",
            JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE, null,
            options, options[1]);
        if (answer == JOptionPane.YES_OPTION) {
          System.exit(0);
        }
      }
    });
  }

  public static void main(String st[]) {
    Main mf = new Main();
    mf.setVisible(true);
  }
}