设个一个带用户名与密码登陆界面，用户可以点击登陆，如果用户与密码为空则给出“请输入提示”;如果没有用户名则可点击注册，注册上有用户名与密的输入，点击注册按钮将判断用户名与密码输入项是否为空，为空给出提示，然后验证密码要两次验证，不一致则给出提示。请用Java完成以上代码

在Java中，你可以使用Swing库创建图形用户界面（GUI），并结合事件监听来处理用户的输入。以下是一个简单的例子，展示了如何创建这样的登录注册界面：

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

public class LoginRegisterFrame extends JFrame {
    private JTextField usernameField;
    private JPasswordField passwordField;
    private JPasswordField confirmPasswordField;

    public LoginRegisterFrame() {
        // 创建窗口
        setTitle("登录注册");
        setSize(400, 300);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        // 创建组件
        JPanel mainPanel = new JPanel();
        JPanel loginPanel = new JPanel();
        JPanel registerPanel = new JPanel();

        JLabel usernameLabel = new JLabel("用户名:");
        usernameField = new JTextField();
        JLabel passwordLabel = new JLabel("密码:");
        passwordField = new JPasswordField();
        JLabel confirmPasswordLabel = new JLabel("确认密码:");
        confirmPasswordField = new JPasswordField();

        JButton loginButton = new JButton("登录");
        JButton registerButton = new JButton("注册");

        // 设置布局
        mainPanel.setLayout(new BoxLayout(mainPanel, BoxLayout.Y_AXIS));
        loginPanel.setLayout(new GridBagLayout());
        registerPanel.setLayout(new GridBagLayout());

        GridBagConstraints gbc = new GridBagConstraints();
        gbc.gridx = 0;
        gbc.gridy = 0;
        gbc.gridwidth = 2;
        gbc.fill = GridBagConstraints.HORIZONTAL;
        loginPanel.add(Box.createHorizontalStrut(5), gbc);
        loginPanel.add(usernameLabel, gbc);
        loginPanel.add(Box.createHorizontalStrut(5), gbc);
        loginPanel.add(usernameField, gbc);
        loginPanel.add(passwordLabel, gbc);
        loginPanel.add(passwordField, gbc);

        gbc.gridy++;
        loginPanel.add(confirmPasswordLabel, gbc);
        loginPanel.add(confirmPasswordField, gbc);
        gbc.gridy++;
        loginPanel.add(loginButton, gbc);

        registerPanel.add(Box.createHorizontalStrut(5), gbc);
        registerPanel.add(usernameLabel, gbc);
        registerPanel.add(Box.createHorizontalStrut(5), gbc);
        registerPanel.add(usernameField, gbc);
        registerPanel.add(passwordLabel, gbc);
        registerPanel.add(passwordField, gbc);
        registerPanel.add(confirmPasswordLabel, gbc);
        registerPanel.add(confirmPasswordField, gbc);
        gbc.gridy++;
        registerPanel.add(registerButton, gbc);

        // 事件监听
        loginButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String username = usernameField.getText();
                String password = new String(passwordField.getPassword());
                if (username.isEmpty() || password.isEmpty()) {
                    JOptionPane.showMessageDialog(null, "请输入用户名和密码!");
                } else if (!password.equals(new String(confirmPasswordField.getPassword()))) {
                    JOptionPane.showMessageDialog(null, "密码不一致，请再次输入!");
                } else {
                    // 这里仅作示例，实际应用中需要连接到数据库或服务器验证
                    System.out.println("登录成功，用户名: " + username);
                }
            }
        });

        registerButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                if (usernameField.getText().isEmpty() || passwordField.getPassword().length == 0 || confirmPasswordField.getPassword().length == 0) {
                    JOptionPane.showMessageDialog(null, "所有字段都不能为空!");
                } else if (!new String(passwordField.getPassword()).equals(new String(confirmPasswordField.getPassword()))) {
                    JOptionPane.showMessageDialog(null, "密码不一致，请再次输入!");
                } else {
                    // 注册过程略...
                    System.out.println("注册成功，用户名: " + usernameField.getText());
                }
            }
        });

        // 添加面板到主窗口
        mainPanel.add(loginPanel);
        mainPanel.add(Box.createVerticalStrut(10));
        mainPanel.add(registerPanel);
        setContentPane(mainPanel);

        setVisible(true);
    }

    public static void main(String[] args) {
        EventQueue.invokeLater(() -> {
            try {
                LoginRegisterFrame frame = new LoginRegisterFrame();
            } catch (Exception e) {
                e.printStackTrace();
            }
        });
    }
}