What are all the classes and interfaces that are available in the collections?
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State the properties of b tree.
Is bucket sort stable?
Is array faster than arraylist?
Is hashtable throw concurrentmodificationexception?
When would you use a tuple?
Can hashmap have same key?
Define general trees?
What are red-black trees?
an array of size N in which every number is between 1 and N, determine if there are any duplicates in it. You are allowed to destroy the array if you like. [ I ended up giving about 4 or 5 different solutions for this, each supposedly better than the others ].
Which sorting is best for large data?
Write a Program for Insert in a sorted list
Describe the level term in a tree.