从文件java代码中使用arraylist进行登录？

import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.Scanner;

ArrayList<User> userList = new ArrayList<>();

class User {
    private String username;
    private String password;

    public User(String username, String password) {
        this.username = username;
        this.password = password;
    }

    public String getUsername() {
        return username;
    }

    public String getPassword() {
        return password;
    }
}

try {
    File file = new File("user.txt");
    Scanner scanner = new Scanner(file);

    while (scanner.hasNextLine()) {
        String line = scanner.nextLine();
        String[] parts = line.split(",");
        String username = parts[0];
        String password = parts[1];

        User user = new User(username, password);
        userList.add(user);
    }

    scanner.close();
} catch (FileNotFoundException e) {
    e.printStackTrace();
}

public boolean login(String username, String password) {
    for (User user : userList) {
        if (user.getUsername().equals(username) && user.getPassword().equals(password)) {
            return true;
        }
    }
    return false;
}