JDialog弹窗

package com.jia.lesson;

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

//主窗口
public class DialogDemo extends Jframe {

    public DialogDemo() {
        this.setVisible(true);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        this.setSize(300, 300);

        //容器
        Container container = this.getContentPane();
        container.setBackground(Color.GREEN);

        //绝对布局
        container.setLayout(null);

        //按钮
        JButton jButton = new JButton();
        jButton.setBounds(30, 30, 200, 200);

        //点击这个按钮的时候,弹出一个弹窗
        jButton.addActionListener(new ActionListener() {//监听器
            @Override
            public void actionPerformed(ActionEvent e) {
                //监听弹窗
                new MyDialog();
            }
        });

        container.add(jButton);

    }

    public static void main(String[] args) {
        DialogDemo dialogDemo = new DialogDemo();
    }
}

//弹窗的窗口,也需要容器装起来
class MyDialog extends JDialog {
    public MyDialog() {
        this.setVisible(true);
        this.setBounds(200, 200, 300, 300);

        //默认有关闭按钮
        //this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        Container container = this.getContentPane();
        container.add(new Label("奥利给"));
        container.setBackground(Color.cyan);
        container.setLayout(null);

    }
}