Xalted Information Systems Core Java Developer interview questions

1st round they give a 2 test 1st one is Aptitude test(multi-threading,collection,etc) 2nd is logical test (no Option) 2nd round they ask to write the code of Q1. Anagram two String without using Array.sort method. Q2. Armstrong number Q3. producer-consumer problem using multi-threading in java Q4. Star pattern in java Q5. Performer in Array without using ArrayList Method like (add,delete,remove).you have to write the own method to add,delete&remove in array 3rd round they ask logical Question base on code that you write in 2nd round 4th round they ask you about your self and family