What is long data type?
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Can treeset contain null?
Is arraylist synchronized?
Explain Queue
What is insertion sort technique?
Is array a linked list?
What is the maximum size of array?
How do you check if a stack is empty or not?
Define primary data structures?
How many types of linked list exist?
What is difference between arraylist and linkedlist?
How do you use merge sort?
Parenthesis are never needed in prefix or postfix expressions. Why?