Define a binary tree?
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Does hashset allow duplicates?
How do you sort an array in decreasing order?
What do you mean by sorting data?
What are the difference between a stack and a queue?
Is array part of collection framework?
What is difference between for loop and foreach?
Define indegree of a graph?
What is static array?
What are the advantages and disadvantages of copyonwritearraylist?
Define open addressing?
What is subtree?
What is map entry?