编写程序，利用JTextField和JPasswordField分别接收用户输入的用户名和密码，并对用户输入的密码进行检验。对于每个用户名有3次输入密码机会。(用匿名类的方式来编写）

以下是使用匿名类的Java代码：

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

public class LoginFrame extends JFrame {
    private JTextField usernameField;
    private JPasswordField passwordField;
    private int loginAttempts;

    public LoginFrame() {
        super("Login");

        JPanel panel = new JPanel();
        panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));

        panel.add(new JLabel("Username:"));
        usernameField = new JTextField(20);
        panel.add(usernameField);

        panel.add(new JLabel("Password:"));
        passwordField = new JPasswordField(20);
        panel.add(passwordField);

        JButton loginButton = new JButton("Login");
        loginButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                if (checkLogin()) {
                    JOptionPane.showMessageDialog(LoginFrame.this, "Login successful!");
                    dispose();
                }
                else if (++loginAttempts == 3) {
                    JOptionPane.showMessageDialog(LoginFrame.this, "Too many login attempts. Program will exit.");
                    System.exit(0);
                }
                else {
                    JOptionPane.showMessageDialog(LoginFrame.this, "Invalid username or password. Please try again.");
                    passwordField.setText("");
                }
            }
        });

        panel.add(loginButton);

        setContentPane(panel);
        pack();
        setLocationRelativeTo(null);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
    }

    private boolean checkLogin() {
        String username = usernameField.getText();
        String password = new String(passwordField.getPassword());

        // Perform some validation here
        // For example, check against a database of users and passwords
        // For simplicity, we just check if the username is "admin" and the password is "password"

        return username.equals("admin") && password.equals("password");
    }

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

这个程序创建了一个登录窗口，并提供了一个文本框和一个密码框用于输入用户名和密码。当用户点击“Login”按钮时，程序将检查输入的用户名和密码是否正确。如果不正确，程序将显示一个错误消息，并清空密码框。如果连续3次输入错误的密码，程序将退出。