The Java Password Validator is a simple application designed to demonstrate the use of the Predicate.not() method in Java for password validation. This application checks whether a password entered by the user meets specific criteria.
- Password Validation: Validates passwords based on predefined criteria.
- Criteria Check: Ensures passwords are at least 8 characters long, contain at least one uppercase letter, and one digit.
- Use of Predicate.not(): Demonstrates the use of
Predicate.not()to negate the result of a predicate for validation.
- Functional Programming: Employs Java's functional programming constructs for concise and readable code.
- Regular Expressions: Uses regular expressions to check for uppercase letters and digits.
- Java Predicates: Demonstrates the use of
Predicateinterface for conditional checks.
- Run the Application: Start by running the
Mainclass. - Enter a Password: Input a password when prompted.
- Validation Output: The application will then display a message indicating whether the password is valid or not, based on the set criteria.
- Minimum Length: The password must be at least 8 characters long.
- Uppercase Letter: At least one uppercase letter is required.
- Digit Inclusion: At least one digit must be included.
- validatePassword Method: This method takes a password as input and returns a
Predicate<String>indicating whether the password meets the criteria. - isInvalidPassword Predicate: Utilizes
Predicate.not()to create a predicate that checks if the password does not meet the criteria.
This application serves as a practical example for those looking to understand and implement Predicate.not() in Java, particularly in the context of string validation. It is an excellent resource for beginners and intermediate Java programmers interested in learning more about functional programming in Java.
Made by Michal Frost.
Happy Coding.