弹窗练习

package com.hai.week2;

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

class MyDialog extends JFrame{
    public MyDialog(){
        setSize(500,500);
        setVisible(true);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        JButton jButton = new JButton("点击弹出一个窗口");
        jButton.setBounds(50,30,200,100);
        jButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                new DemoJdialog().init();
            }
        });
        Container container = this.getContentPane();
        container.add(jButton);
        container.setLayout(null);

    }
}
public class Demo09 {
    public static void main(String[] args) {
        new MyDialog();
    }
}
class DemoJdialog extends JDialog{
    public void init(){
        setSize(200,200);
        setVisible(true);
        Container container =this.getContentPane();
        JLabel jLabel = new JLabel("魈太帅了");
        jLabel.setBounds(20,20,200,100);
        jLabel.setHorizontalAlignment(SwingConstants.CENTER);
        container.add(jLabel);
        container.setLayout(null);
    }
}