java图形用户界面登录

根据提供的引用内容，以下是一个简单的Java图形用户界面登录的示例：

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

public class LoginGUI extends JFrame {
    private JLabel usernameLabel, passwordLabel;
    private JTextField usernameField;
    private JPasswordField passwordField;
    private JButton loginButton;

    public LoginGUI() {
        setTitle("登录");
        setBounds(100, 100, 300, 200);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLayout(new GridLayout(3, 2));

        usernameLabel = new JLabel("用户名：");
        passwordLabel = new JLabel("密码：");
        usernameField = new JTextField();
        passwordField = new JPasswordField();
        loginButton = new JButton("登录");

        add(usernameLabel);
        add(usernameField);
        add(passwordLabel);
        add(passwordField);
        add(new JLabel());
        add(loginButton);

        loginButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String username = usernameField.getText();
                String password = new String(passwordField.getPassword());

                // 在这里可以添加验证逻辑，比如与数据库中的用户名和密码进行比对

                if (username.equals("admin") && password.equals("123456")) {
                    JOptionPane.showMessageDialog(null, "登录成功！");
                } else {
                    JOptionPane.showMessageDialog(null, "用户名或密码错误！");
                }
            }
        });
    }

    public static void main(String[] args) {
        LoginGUI loginGUI = new LoginGUI();
        loginGUI.setVisible(true);
    }
}