Utility Class

Create a PasswordCheckerUtility class based on the Javadoc given you. The PasswordCheckerUtility class will have at least three methods: One method will check the validity of one password and return true if the password is valid and throw an exception if invalid.

One method will check for a weak password, i.e., one whose length is between 6 and 9, inclusive. Do NOT throw an exception.

One method will check an ArrayList of passwords and return an ArrayList with the status of any invalid passwords (weak passwords are not considered invalid). The ArrayList of invalid passwords will be of the following format:

The methods will have the following headers:

static boolean isValidPassword(String pwdString);

static boolean isWeakPassword(String pwdString);

static ArrayList invalidPasswords(ArrayList passwords);

Always check for the length of the password first, since that is the easiest and fastest check. Once the password fails one rule, you do not need to check the rest of the rules.

JAVA DOC

Class PasswordCheckerUtility

java.lang.Object PasswordCheckerUtility public final class PasswordCheckerUtility extends java.lang.Object

Constructor Summary PasswordCheckerUtility()

Method Summary static boolean isValidPassword(java.lang.String passwordString) Return true if valid, returns false if an invalid password static boolean isWeakPassword(java.lang.String passwordString) Return true if length of password is greater or equal to 6 but less than or equal to 9 static java.util.ArrayList invalidPasswords(java.util.ArrayList passwords) Returns an arraylist of invalid passwords (weak passwords are not considered invalid)

Methods inherited from class java.lang.Object equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail PasswordCheckerUtility

public PasswordCheckerUtility() Method Detail isValidPassword

public static boolean isValidPassword(java.lang.String passwordString) throws LengthException, NoDigitException, NoUpperAlphaException, NoLowerAlphaException, InvalidSequenceException Returns true if valid password. Throws exceptions for invalid passwords. Valid if password is greater than or equal to 6 characters, has at least one digit, has at least on upper-case alphabetic character, has at least on lower-case alphabetic character, and has no more than two of the same character in a row.

Parameters:

passwordString - - string to be checked for validity

Returns:

true if valid password, set up to return false if an invalid password, but throws an exception instead.

Throws:

LengthException - thrown if length is less than 6 characters

NoDigitException - thrown if no digit

NoUpperAlphaException - thrown if no uppercase alphabetic

NoLowerAlphaException - thrown if no lowercase alphabetic

InvalidSequenceException - thrown if more than 2 of same character.

isWeakPassword

public static boolean isWeakPassword(java.lang.String passwordString) Return true if length of password is greater than or equal to 6 but less than or equal to 9

Parameters:

passwordString - - string to be checked if weak password

Returns:

true if length of password is greater than or equal to 6 but less than or equal to 9

invalidPasswords

public static java.util.ArrayList invalidPasswords(java.util.ArrayList passwords) Returns an arraylist of invalid passwords (weak passwords are not considered invalid)

Parameters:

passwords - arraylist of passwords to check for validity

Returns:

arraylist of invalid passwords. It will not return weak passwords.