提供eclipse登录注册界面代码

以下是一个简单的Eclipse登录注册界面的示例代码：

import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTextField;
import javax.swing.JPasswordField;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

public class LoginRegisterUI extends JFrame {

    private JPanel contentPane;
    private JTextField textFieldUsername;
    private JPasswordField passwordField;
    private JTextField textFieldNewUsername;
    private JPasswordField passwordFieldNew;
    private JPasswordField passwordFieldConfirm;

    public static void main(String[] args) {
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    LoginRegisterUI frame = new LoginRegisterUI();
                    frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    public LoginRegisterUI() {
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setBounds(100, 100, 450, 300);
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        contentPane.setLayout(null);

        JLabel lblUsername = new JLabel("Username:");
        lblUsername.setBounds(62, 50, 80, 14);
        contentPane.add(lblUsername);

        textFieldUsername = new JTextField();
        textFieldUsername.setBounds(152, 47, 194, 20);
        contentPane.add(textFieldUsername);
        textFieldUsername.setColumns(10);

        JLabel lblPassword = new JLabel("Password:");
        lblPassword.setBounds(62, 90, 80, 14);
        contentPane.add(lblPassword);

        passwordField = new JPasswordField();
        passwordField.setBounds(152, 87, 194, 20);
        contentPane.add(passwordField);

        JButton btnLogin = new JButton("Login");
        btnLogin.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String username = textFieldUsername.getText();
                String password = new String(passwordField.getPassword());
                if (username.equals("admin") && password.equals("password")) {
                    JOptionPane.showMessageDialog(LoginRegisterUI.this, "Login successful!");
                } else {
                    JOptionPane.showMessageDialog(LoginRegisterUI.this, "Invalid username or password.");
                }
            }
        });
        btnLogin.setBounds(152, 128, 89, 23);
        contentPane.add(btnLogin);

        JLabel lblNewUsername = new JLabel("New username:");
        lblNewUsername.setBounds(62, 180, 80, 14);
        contentPane.add(lblNewUsername);

        textFieldNewUsername = new JTextField();
        textFieldNewUsername.setBounds(152, 177, 194, 20);
        contentPane.add(textFieldNewUsername);
        textFieldNewUsername.setColumns(10);

        JLabel lblNewPassword = new JLabel("New password:");
        lblNewPassword.setBounds(62, 210, 80, 14);
        contentPane.add(lblNewPassword);

        passwordFieldNew = new JPasswordField();
        passwordFieldNew.setBounds(152, 207, 194, 20);
        contentPane.add(passwordFieldNew);

        JLabel lblConfirmPassword = new JLabel("Confirm password:");
        lblConfirmPassword.setBounds(62, 240, 100, 14);
        contentPane.add(lblConfirmPassword);

        passwordFieldConfirm = new JPasswordField();
        passwordFieldConfirm.setBounds(152, 237, 194, 20);
        contentPane.add(passwordFieldConfirm);

        JButton btnRegister = new JButton("Register");
        btnRegister.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String newUsername = textFieldNewUsername.getText();
                String newPassword = new String(passwordFieldNew.getPassword());
                String confirmPassword = new String(passwordFieldConfirm.getPassword());
                if (newUsername.equals("") || newPassword.equals("") || confirmPassword.equals("")) {
                    JOptionPane.showMessageDialog(LoginRegisterUI.this, "Please fill in all fields.");
                } else if (!newPassword.equals(confirmPassword)) {
                    JOptionPane.showMessageDialog(LoginRegisterUI.this, "Passwords do not match.");
                } else {
                    JOptionPane.showMessageDialog(LoginRegisterUI.this, "Registration successful!");
                }
            }
        });
        btnRegister.setBounds(256, 128, 89, 23);
        contentPane.add(btnRegister);
    }
}

这段代码创建了一个包含登录和注册选项卡的窗体。其中，登录选项卡包括用户名和密码字段以及一个登录按钮，注册选项卡包括新用户名、新密码和确认密码字段以及一个注册按钮。当用户单击登录按钮时，程序将检查输入的用户名和密码是否与硬编码的值匹配，如果匹配，则显示“登录成功”消息框。当用户单击注册按钮时，程序将检查所有字段是否填写完整并且新密码和确认密码是否匹配。如果满足条件，则显示“注册成功”消息框。