java弹出窗口怎么写 java弹出窗口代码

java弹出窗口JDialog弹窗

package lesson5;

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.setSize(700,500);
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        //JFrame 放东西，容器
        Container container =this.getContentPane();
        //绝对布局
        container.setLayout(null);

        //按钮
        JButton button = new JButton("点击弹出对话框");//创建对象
        button.setBounds(30,30,200,50);



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

        //加入容器
        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);

           Container container = this.getContentPane();
           //container.setLayout(null);
           //container.add(new Label("java学习测试"));

           JLabel label=new JLabel("text测试");
           container.add(label);

           //让文本居中
           label.setHorizontalAlignment(SwingConstants.CENTER);

       }

}