在JApplet中无法开启JDialog的问题?

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import java.awt.Container;
import java.awt.GridLayout;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
 
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
 
public class jdTest extends JFrame{
  private static final long serialVersionUID = 1; private static int width = 480; private static int height = 300; private JButton oval = new JButton("test");
  public jdTest() { super("aa"); this.setLayout(new GridLayout(4, 1)); this.setBounds(new Rectangle(200, 200, width, height)); JPanel p = new JPanel(); oval.addActionListener(new MyActionListener()); p.add(oval); this.add(p); JPanel p1 = new JPanel(); this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); this.setVisible(true); }
  public static void main(String[] args) { new jdTest(); } public class MyActionListener implements ActionListener { public void actionPerformed(ActionEvent e) { JDialog dialogOval = new JDialog(jdTest.this, "Draw Oval"); JDialog.setDefaultLookAndFeelDecorated(true); dialogOval.setBounds(new Rectangle(200, 200, 200, 200)); dialogOval.setDefaultCloseOperation(JDialog.HIDE_ON_CLOSE); dialogOval.setVisible(true); } }
}

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import java.io.*;
import java.util.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.table.*;
import javax.swing.event.MouseInputAdapter;
import javax.swing.event.*;
import java.awt.event.MouseEvent;
import java.lang.Math;
import java.awt.image.BufferedImage;
import java.awt.geom.AffineTransform;
import java.awt.geom.Line2D;
import java.util.*;
import java.awt.geom.Ellipse2D;
import netscape.javascript.JSObject; //used for communicate with javascript
 
public class Test98 extends JApplet{ ... public void init() { ... mnNew=new JMenuItem("New"); mnNew.addActionListener(new MyActionListener()); mnFile.add(mnNew); ... } public class MyActionListener implements ActionListener { public void actionPerformed(ActionEvent e){ ... else if (e.getSource() == mnNew){ JDialog dialogOval = new JDialog(Test98.this, "hello"); JDialog.setDefaultLookAndFeelDecorated(true); dialogOval.setBounds(new Rectangle(200, 200, 200, 200)); dialogOval.setDefaultCloseOperation(JDialog.HIDE_ON_CLOSE); dialogOval.setVisible(true); } } } ... public static void main(String argv[]) { if(argv.length > 0){ latFileName=argv[0]; } final Test98 demo = new Test98(); demo.init(); JFrame f = new JFrame("Java 2D(TM) Demo - Test98"); f.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) {System.exit(0);} }); f.getContentPane().add("Center", demo); f.pack();
// f.setSize(new Dimension(820,670)); //820 = 600 + 20(scrollbar) + 200 , 670 = 30 + 600 + 20(scrollbar) + 20 f.show(); } }
...