The list of questions asked at the Deltax interview can be vast but we are here presenting some selected questions only. Although you are not going to face the same questions you will get an approximate idea about your face to face interview. Write a code to check if a string is a palindrome or not. Print all permutations of string both iterative and recursively. How to find the first non repeated character of any given string? Tell me how will you convert the numeric string in Java? Among the Char array and string for storing password which one will you prefer and why? In an array 1-100 multiple numbers are duplicates, how do you find it? In an array how will you find the top two maximum numbers? In a single pass, how will you find the 3rd element from the last? Give me two differences between the array data structure and the linked list. In Java how will you check whether the tree is balanced or not?