Differentiate between iterator and enumeration.
What are the topics in data structures?
Which is faster treemap or hashmap?
What is difference between hashmap and hashtable?
Which sort is stable?
Why do we need sorting algorithms?
What does sorting an array do?
Describe the level term in a tree.
List out the advantages of using a linked list?
Name some applications which use linked lists.
What is a treeset?
Is arraylist fail fast?
Explain linked list in short.