求助，为何不能弹出窗口

Question

import java.awt.Color;

import java.awt.Container;

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.SwingConstants;

import javax.swing.WindowConstants;

class MyDialog extends JDialog{

public MyDialog(MyFrame frame){

super(frame,"第一个Jdialog窗口",true);

Container container=getContentPane();

container.add(new JLabel("这是与各对话框"));

setBounds(120,120,100,100);

}

}

public class MyFrame extends JFrame {

public static void main(String[] args) {

new MyFrame();

}

public MyFrame(){

Container container=getContentPane();

container.setLayout(null);

JLabel jl=new JLabel("这是一个JFrame窗口");

jl.setHorizontalAlignment(SwingConstants.CENTER);

container.add(jl);

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 MyDialog(MyFrame.this).setVisible(true);

}

});

container.add(bl);

bl.setVisible(true);

jl.setVisible(true);

container.setBackground(Color.blue);

setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);

}

}

Answer 1

你这一行注释都不带写的啊,

Answer 2

我的神啊，，各位师兄师姐们求助啊