Wipro Project Engineer interview questions

This is wipro elite role hiring for Java full stack role. But once inside wipro, you could be assigned to any project and tech stack based on internal interviews done by project managers. Business Discussion Round Interview questions how much would you rate yourself in java Diamond problem Difference between abstract class and interface How does hashmap work internally and how it handles conflict in it? What are String class and string buffer, string builder Some Java syntax questions and logic questions like ( String s = "3" s = s+5; sysout(s) what happens(35? but strings are immutable right??)) Some behaviourial questions if theres a conflict in idea in a team with team members in team lead what would you do? IF theres a short deadline in the task and one person from your team is on leave what would you do? if theres a new task that is assigned to you . what steps would you take to complete the task some DB questions worked on DB design? Whats normalization what is unique key (distinct value and 1 null value allowed, he said wrong) what is primary and foreign key and some OOPS method overloading and method overriding(pseudo code and explaination) runtime exception and compile time exception