What is a 2 dimensional array?
What is meant by binary tree?
What is data type in data structure?
What is a treemap used for?
Can treeset contain duplicates?
Differentiate between iterator and enumeration.
Differentiate between an array and an arraylist.
How do I start preparing for placement?
What is advantage and disadvantage of linked list?
Explain quick sort and merge sort algorithms.
Can arraylist store objects?
What is binary tree? Explain its uses.
Why do we use collections?