java鼠标弹窗处理

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
class myjd extends JDialog
{
     public myjd(cre fra)
     {
    	 super(fra,"第一个jddialog窗体",true);
    	 Container container =getContentPane();
    	 container.add(new JLabel("这是一个对话框"));
    	 setBounds(120,120,100,100);
     }
}
public class cre extends JFrame{

	/**
	 * @param args
	 */
	public void creat(String title)
	{
		JFrame jf = new JFrame();  
        Container container=jf.getContentPane();
        container.setLayout(null);
        JLabel jl=new JLabel(title);
        jl.setHorizontalAlignment(SwingConstants.CENTER);
        container.add(jl);
        container.setBackground(Color.blue);
        jf.setVisible(true);
        jf.setSize(400,400);
        JButton bl =new JButton("弹出对话框");
        bl.setBounds(10,10,100,21);
        bl.addActionListener(new ActionListener(){
         public void actionPerformed(ActionEvent e)
         {
        	 new myjd(cre.this).setVisible(true);
         }
        });
        container.add(bl);
        //container.setVisible(true);
	}
	public static void main(String[] args) {
		new cre().creat("hellow world");
	}

}