用JAVA设计一个QQ登录界面

好的，我可以为您提供一个简单的QQ登录界面的JAVA代码示例：

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

public class QQLogin extends JFrame implements ActionListener {
    private JLabel accountLabel, passwordLabel;
    private JTextField accountField;
    private JPasswordField passwordField;
    private JButton loginButton, cancelButton;

    public QQLogin() {
        super("QQ Login");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(300, 150);
        setLocationRelativeTo(null);

        accountLabel = new JLabel("Account:");
        passwordLabel = new JLabel("Password:");
        accountField = new JTextField(15);
        passwordField = new JPasswordField(15);
        loginButton = new JButton("Login");
        cancelButton = new JButton("Cancel");

        JPanel panel = new JPanel(new GridLayout(3, 2));
        panel.add(accountLabel);
        panel.add(accountField);
        panel.add(passwordLabel);
        panel.add(passwordField);
        panel.add(loginButton);
        panel.add(cancelButton);
        add(panel);

        loginButton.addActionListener(this);
        cancelButton.addActionListener(this);

        setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == loginButton) {
            String account = accountField.getText();
            String password = new String(passwordField.getPassword());
            if (account.equals("") || password.equals("")) {
                JOptionPane.showMessageDialog(this, "Please enter account and password", "Error", JOptionPane.ERROR_MESSAGE);
                return;
            }
            // 进行登录操作
            JOptionPane.showMessageDialog(this, "Login succeed!", "Message", JOptionPane.INFORMATION_MESSAGE);
            dispose();
        } else if (e.getSource() == cancelButton) {
            dispose();
        }
    }

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

这段代码使用了JFrame、JLabel、JTextField、JPasswordField、JButton和JOptionPane等Swing组件，实现了一个简单的QQ登录界面。您可以根据需要进行修改和完善。