Why is hashmap not thread safe?
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Define threaded binary tree. Explain its common uses
What is difference between hashset and linkedhashset?
How many types of linked list are there?
How many sorting techniques are there?
What is the use of substring?
Which is faster binary or linear search?
What are AVL trees?
Define balanced trees?
What are the advantages of linked list over array (static data structure)?
Which is faster hashmap or hashset?
Why do we use sorting?
Tell me what should be done in the base case for this recursive problem?