Differentiate between iterator and listiterator.
How treemap orders the elements if the key is a string?
Which language is best for data structures?
When would you use a hashmap?
How do hash tables work?
Which is faster hashmap or concurrenthashmap?
Is a list an array?
How can you add an item to the beginning of the list?
When ArrayIndexOutOfBoundsException occurs?
What is the complexity of arrays sort?
State the properties of b tree.
Define the tree data structure.
Can you declare an array without assigning the size of an array?