How do I sort hashset?
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What is the difference between hashset and treeset?
What happens if we try to insert duplicate key in hashmap?
Can arraylist store objects?
What is difference between set and map?
where do you use double linked list?
What is meant by linked list?
Parenthesis is never required in postfix or prefix expressions, why?
Which is faster hashmap or hashtable?
What is difference between tree and forest?
“int a[] = new int[3]{1, 2, 3}” – This a legal way of defining the arrays?
Which data structures are used in bfs and dfs algorithm?
Evaluate the following prefix expression " ++ 26 + - 1324" (Similar types can be asked)