java案例代码14-guiJframe简单小案例

package gui;

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

public class Jframegui {
    public static void main(String[] args) {
        //1.创建窗口
        Jframe win=new Jframe("登录界面");
        JPanel panel=new JPanel();
        win.add(panel);

        //2.创建一个按钮对象
        JButton btn=new JButton("登录");

        btn.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                JOptionPane.showMessageDialog(win,"点击一下，我就动一下！");
            }

        });

        //3.把按钮对象天剑到桌布上显示

        panel.add(btn);

        //4.展示窗口
        win.setSize(400,300);
        win.setLocationRelativeTo(null);
        win.setVisible(true);




    }
}