Are collections thread safe?
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How do you find a string is anagram or not?
Which is better stack or queue?
What exactly is data?
What is the difference between list, set and map?
Define the queue data structure.
What is application of data structure?
Can hashmap have duplicate keys?
what is the difference between dynamic as well as non - dynamic data structures.
Does arraylist guarantee insertion order?
Difference between arrays and linked list?
What is time complexity of binary search?
Does hashtable allow null values?