弹窗-2022-12-12

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

public class DialogDemo extends JFrame {

    public DialogDemo(){
        this.setVisible(true);
        this.setSize(700,500);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        //放东西，需要容器
        Container container = this.getContentPane();
        container.setLayout(null);

        //按钮
        JButton button = new JButton("点击一个对话框");
        button.setBounds(30,30,200,50);

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

        container.add(button);

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

//弹窗的窗口
class MyDialogDemo extends JDialog{

    public MyDialogDemo() {
        this.setVisible(true);
        this.setBounds(100,100,500,500);
        // this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); 默认就有关闭事件

        Container container = this.getContentPane();
        container.setLayout(null);

        container.add(new Label("学习永无止境"));

    }
}