用JAVA设计一个QQ登录界面

好的！以下是一个简单的QQ登录界面设计：

import javax.swing.*;
import java.awt.*;

public class QQLogin {
    public static void main(String[] args) {
        // 创建窗口
        JFrame frame = new JFrame("QQ登录");
        frame.setSize(300, 200);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLocationRelativeTo(null);

        // 创建面板
        JPanel panel = new JPanel(new GridBagLayout());
        frame.add(panel, BorderLayout.CENTER);

        // 创建组件
        JLabel userLabel = new JLabel("用户名:");
        JTextField userTextField = new JTextField(20);

        JLabel passwordLabel = new JLabel("密码:");
        JPasswordField passwordField = new JPasswordField(20);

        JButton loginButton = new JButton("登录");
        JButton cancelButton = new JButton("取消");

        // 添加组件到面板
        GridBagConstraints constraints = new GridBagConstraints();
        constraints.gridx = 0;
        constraints.gridy = 0;
        constraints.insets = new Insets(10, 10, 10, 10);
        panel.add(userLabel, constraints);

        constraints.gridx = 1;
        panel.add(userTextField, constraints);

        constraints.gridx = 0;
        constraints.gridy = 1;
        panel.add(passwordLabel, constraints);

        constraints.gridx = 1;
        panel.add(passwordField, constraints);

        constraints.gridx = 0;
        constraints.gridy = 2;
        constraints.gridwidth = 2;
        constraints.anchor = GridBagConstraints.CENTER;
        panel.add(loginButton, constraints);

        constraints.gridx = 0;
        constraints.gridy = 3;
        constraints.gridwidth = 2;
        constraints.anchor = GridBagConstraints.CENTER;
        panel.add(cancelButton, constraints);

        // 显示窗口
        frame.setVisible(true);
    }
}

这是一个基本的登录界面，包含了用户名、密码输入框和登录、取消按钮。你可以根据需要自行修改和美化。