Write a Java program that implements a password validator using a custom exception InvalidPasswordException. The program should have a method validatePassword that takes a string as an argument representing a password and checks its validity based on the following rules: The password should be at least 12 characters long.The password should be a combination of uppercase and lowercase letters, numbers, and symbols.If the password does not meet these criteria, the validatePassword method should throw an InvalidPasswordException with an appropriate error message. Provide 5 sample inputs and their corresponding expected outputs to demonstrate the functionality of the validatePassword method.Expected Output:For a valid password, the output should be "Password is valid."For a password that is too short, the output should be "Invalid Password: Password should be at least 12 characters long."For a password without required characters, the output should be "Invalid Password: Password should be a combination of uppercase and lowercase letters, numbers, and symbols."Sample Input:"Strong@Password123"Sample Output:Password is valid.
Question
Write a Java program that implements a password validator using a custom exception InvalidPasswordException. The program should have a method validatePassword that takes a string as an argument representing a password and checks its validity based on the following rules: The password should be at least 12 characters long.The password should be a combination of uppercase and lowercase letters, numbers, and symbols.If the password does not meet these criteria, the validatePassword method should throw an InvalidPasswordException with an appropriate error message. Provide 5 sample inputs and their corresponding expected outputs to demonstrate the functionality of the validatePassword method.Expected Output:For a valid password, the output should be "Password is valid."For a password that is too short, the output should be "Invalid Password: Password should be at least 12 characters long."For a password without required characters, the output should be "Invalid Password: Password should be a combination of uppercase and lowercase letters, numbers, and symbols."Sample Input:"Strong@Password123"Sample Output:Password is valid.
Solution
Here is a Java program that implements a password validator using a custom exception InvalidPasswordException.
public class Main {
public static void main(String[] args) {
try {
validatePassword("Strong@Password123");
System.out.println("Password is valid.");
} catch (InvalidPasswordException e) {
System.out.println(e.getMessage());
}
}
public static void validatePassword(String password) throws InvalidPasswordException {
if (password.length() < 12) {
throw new InvalidPasswordException("Invalid Password: Password should be at least 12 characters long.");
}
if (!password.matches("^(?=.*[0-9])(?=.*[a-z])(?=.*[A-Z])(?=.*[@#$%^&+=])(?=\\S+$).{12,}$")) {
throw new InvalidPasswordException("Invalid Password: Password should be a combination of uppercase and lowercase letters, numbers, and symbols.");
}
}
}
class InvalidPasswordException extends Exception {
public InvalidPasswordException(String message) {
super(message);
}
}
This program defines a validatePassword method that checks if the password is at least 12 characters long and contains a combination of uppercase and lowercase letters, numbers, and symbols. If the password does not meet these criteria, the method throws an InvalidPasswordException with an appropriate error message.
Here are 5 sample inputs and their corresponding expected outputs:
- Input: "Strong@Password123" Output: "Password is valid."
- Input: "short" Output: "Invalid Password: Password should be at least 12 characters long."
- Input: "alllowercase123@" Output: "Invalid Password: Password should be a combination of uppercase and lowercase letters, numbers, and symbols."
- Input: "NOLOWERCASE123@" Output: "Invalid Password: Password should be a combination of uppercase and lowercase letters, numbers, and symbols."
- Input: "NoSymbols123" Output: "Invalid Password: Password should be a combination of uppercase and lowercase letters, numbers, and symbols."
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