Is null allowed in list?
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What is the default size of an arraylist?
Which is better hashset or treeset?
Define non-terminal nodes in a tree?
What are the advantages of sorting and filtering data?
Why is map not a collection?
What is the best case time complexity of bubble sort?
Does arraylist contain duplicates?
What is a subtree?
Why is hashmap not thread safe?
Which collection is used for sort?
Why do we use binary search?
What is the advantage of circular linked list?