What happens if we put a key object in a hashmap which exists?
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Is hashset thread safe?
What is difference between hashset and treeset?
What is an externalizable interface?
What is mean by selection sort?
Define parent node?
Is array static or dynamic?
Why is data structure used?
Which method will arrange the element of an array in alphabetical order?
Give us a program to reverse a linked list.
Define heap order property?
Define red-black trees.
What is the method to find the complexity of an algorithm?