What is the order of selection sort?
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Can we add duplicate keys in a hashmap?
in tree construction which is the suitable efficient data structure? (Array, linked list, stack, queue)
If you are given a choice to use either arraylist and linkedlist, which one would you use and why?
Define a stack?
What thread means?
Which are the sorted collections?
How many types of linked lists are there?
Why do we use collections?
What is complexity of bubble sort?
Which sorting has less time complexity?
Define in brief an array.
Can we insert null in hashset?