Why do we use collections?
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What package is arraylist?
what is binary tree?
How will you check the validity of an expression containing nested parentheses?
What happens if we put a key object in a hashmap which exists?
What is a queue in data structure?
When is a binary search algorithm best applied?
What is array indexing?
Does hashtable allow null values?
What are the disadvantages of using collection classes over arrays?
A lot of data structures related programs related to only trees and graphs, like the diameter of a tree, removing the loops in a graph etc.
Define a full binary tree ?
Which is the fastest sorting?