How does a treemap work?
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List the data structures which are used in rdbms, network data modal, and hierarchical data model.
Which collection allows null values?
Difference between arraylist and linkedlist?
What is a class user?
Which sorting algorithm is worst?
Differentiate between hashset and treeset.
What is binary tree and its properties?
Describe stack operation.
What is the Role of push() and pop() method?
List the differences between comparable and comparator interface?
How does quick sort work?
Why is merge sort faster?