java swing 问题，应该还有一个窗口的呀

package swing;

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class JFrameTest {
    public static void main(String[] args) {
        JFrame myframe = new JFrame("my FRAME");
        myframe.getContentPane().setLayout(new FlowLayout());
        myframe.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        myframe.addMouseListener(new FrameMouseAdapter(myframe));
        myframe.setSize(400, 300);
        myframe.setLocationRelativeTo(null);
        JLabel jLabel = new JLabel();
        jLabel.setText("请单击本窗口");
        myframe.getContentPane().add(jLabel);
        myframe.setVisible(true);
    }

}

class FrameMouseAdapter extends MouseAdapter {
    JFrame owner;

    FrameMouseAdapter(JFrame owner) {
        this.owner = owner;

    }

    public void mouseCliked(MouseEvent e) {
        JDialog jDialog = new JDialog(owner, true);
        jDialog.setTitle("这是一个对话框");
        jDialog.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
        jDialog.setBounds(400, 300, 282, 247);
        jDialog.setResizable(false);
        jDialog.setVisible(true);
    }
}