MTX Group Consultant Trainee Interview Questions and Answers

Array is a fixed size data structure while array list is a dynamic size data structure.

• Array is a basic data structure in programming with a fixed size.

• Array list is a dynamic data structure that can grow or shrink in size.

• Array elements are stored in contiguous memory locations.

• Array list elements are stored in non-contiguous memory locations.

• Array list allows insertion and deletion of elements at any position.

• Array d...read more

Hashmap stores key-value pairs while hashset stores only unique values.

• Hashmap allows null keys and values while hashset doesn't allow null values.

• Hashmap uses key to retrieve value while hashset uses value itself to retrieve.

• Example: Hashmap - {1:'one', 2:'two'}, Hashset - {'one', 'two', 'three'}