Java Swing - 如何extends AbstractAction

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import java.awt.Dialog;
import java.awt.Window;
import java.awt.event.ActionEvent;
import javax.swing.AbstractAction;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
public class Main {
  public static void main(String[] args) {
    MainPanelGen mainPanelGen = new MainPanelGen();
    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.getContentPane().add(mainPanelGen.getMainPanel());
    frame.pack();
    frame.setVisible(true);
  }
}
class MainPanelGen {
  JPanel mainPanel = new JPanel();
  JTextField field = new JTextField(10);
  JButton btn = new JButton(new BtnActn());
  JDialog dialog;
  DialogPanel dialogPanel = new DialogPanel();
  public MainPanelGen() {
    mainPanel.add(field);
    mainPanel.add(btn);
 
 
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