package Base; public class User { private String email; private String password; public User(String email) { this.email = email; } public String get_email() { return email; } public String get_password() { return password; } public void set_password(String password) { this.password = password; } public static boolean check_password(String password) { if (password == null || password.length() < 6 || password.length() > 20) { return false; } boolean hasUpper = false; boolean hasLower = false; boolean hasDigit = false; for (char c : password.toCharArray()) { if (Character.isUpperCase(c)) hasUpper = true; if (Character.isLowerCase(c)) hasLower = true; if (Character.isDigit(c)) hasDigit = true; } return hasUpper && hasLower && hasDigit; } }