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Here is the collection of the frequently asked questions based on the experience of interviews in multiple companies.

1	Lowest common Ancestor
2	An unsorted array of integers is given; you must find the max product formed by multiplying three numbers. (You cannot sort the array, watch out when there are negative numbers)
3	Left View of a tree
4	Reversing of Arrays
5	Cache Line, Cache internal concept, RR scheduling
6	Print the middle of a given linked list
7	Pair-wise swap of elements in a linked list
8	HashMap internals
9	Double checking Singleton
10	Factory Pattern
11	Print a given matrix in spiral form
12	DFS on Graph and its representation
13	Object-Oriented concept
14	Print nth last node in the linked list
15	Delete a given node in Linked List under the given constraints
16	Implement Stack using Queues
17	Find if two rectangles overlap
18	Multithreading concepts
19	Given an array of integers, update the index with the multiplication of previous and next integers.
20	Difference between creating threads in Java using Thread and Runnable
21	How HashSet is implemented in Java internally.
22	DeadLock example code (Producer & Consumer Problem)
23	Find the number which is not repeated in an Array of integers, others are present two times. (Non-Repeating Element)
24	Serialization and related concepts.
25	Comparators in TreeSet

Frequently Asked Interview Questions in Technical Rounds