Define the tree data structure.
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Differentiate linear from non linear data structure?
How many null values are allowed in hashmap?
What is quick sort?
Differentiate between failfast and failsafe.
Which interfaces are implemented by linkedhashset?
What is the use of substring?
How to check array contains value or not?
How to get top two numbers from an array?
Can sets contain duplicates?
What does it mean to sort an array?
What is the difference between the hash table and hash map?
What are the pre-requisite for the collection to perform binary search?