UsernameValidator Class Solution Class main Method. Given an array of integers, find and print the minimum absolute difference between any two elements in the array. After I add it, I still get wrong answer. According to the policy, a username is considered valid if all the following constraints are satisfied: Update the value of regularExpression field in the UsernameValidator class so that the regular expression only matches with valid usernames. Solution originally posted at: Github by @Java-aid Leaderboard. We help companies accurately assess, interview, and hire top developers for a myriad of roles. Editorial. out. Plants = {(6,1), (5,2), (4,4)}. For each of the usernames, the code prints true if the username is valid; otherwise false each on a new line. Input Format. We save a programmer time to search for solutions on the internet. It just keeps showing me wrong answer. 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