How null key is handled in hashmap?
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Can arraylist be null?
What are the different types of data structures?
Explain in brief a linked list.
What is the difference between hashmap and treemap?
What is bubble sort technique?
What is sort order?
What is a hashers run?
What are the advantages and disadvantages of linked list?
What sort does arrays sort use?
Is it necessary to sort a file before searching a particular item ?
What is the difference between array sort () and array sort t >()?
How would you reverse characters of an array without using indexing in the array.