Amazon Software Engineer Intern interview questions

Got an interview call by email with 2 time slots after 4 days. Had to select 1 of them. 2 back to back phone interviews. Each interviewer asked 2 questions each.

normal algorithms questions, like find word freq, reverse linked list, out put a tree in level order, have to be familiar with the data structures and algorithms, also have ques about tesing and ood, like what is the difference between interface and abstact class, how hash map works so on, what is unit test, things like that