Differentiate between collection and collections.
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What is nonlinear data?
Is hashmap get thread safe?
Why is arraylist used?
How to fill element (initialize at once) in an array?
How can we reverse a singly linked list?
Which is best array or linked list?
What is difference between hashmap and map?
Define a complete binary tree?
How do you find the height of a binary tree?
Explain linked list in short.
What is array simple?
Does treemap allow null keys?