Mphasis Full Stack Software Developer Interview Questions and Answers

General aptitude, computer science fundamentals multiple-choice questions, and data structures and algorithms multiple-choice questions were asked.

Q1. Given a string, write a function to reverse the string.
Ans. 
Function to reverse a given string
• Create an empty string to store the reversed string

• Iterate through the input string in reverse order and append each character to the new string

• Return the reversed string
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Q2. Given a sorted array of integers, write a function to perform a binary search to find the index of a target value. If the target value is not found, return -1.
Ans. 
Binary search function to find target value in sorted array
• Define function that takes sorted array and target value as input

• Initialize variables for start, end, and middle indices

• Use while loop to iterate until start is less than or equal to end
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Q1. About the company
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Q2. What are three significant achievements in your life?
Ans. 
Graduating with honors, winning a hackathon, volunteering in a developing country
• Graduated with honors from university with a degree in Computer Science

• Won first place in a hackathon competition by developing a unique and innovative software solution

• Volunteered in a developing country to help build schools and provide education to underprivileged children
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Q1. What is concurrent hashmap
Ans. 
ConcurrentHashMap is a thread-safe implementation of the HashMap class in Java.
• ConcurrentHashMap allows multiple threads to read and write to the map concurrently without causing any data corruption.

• It achieves thread-safety by dividing the map into segments, each of which can be locked independently.

• ConcurrentHashMap is more efficient than using synchronized collections for concurrent access.

• Example: ConcurrentHashMap
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Q2. How is dependency injection different from dependency inversion
Ans. 
Dependency injection is a design pattern where dependencies are provided to a class from the outside, while dependency inversion is a principle that states high-level modules should not depend on low-level modules, but both should depend on abstractions.
• Dependency injection is a technique to achieve dependency inversion.

• Dependency injection involves providing dependencies to a class from the outside, typically through ...read more
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Q3. If I add 2 same attribute values for a object to a set...will I see 2 objects in the set, if yes what changes you make to the code to insert unique objects to a set
Ans. 
No, you will not see 2 objects in the set. To insert unique objects to a set, you can override the equals() and hashCode() methods in the object class.
• In a set, each element must be unique based on the equals() method. If you add 2 objects with the same attribute values, only one will be stored in the set.

• To ensure uniqueness, override the equals() and hashCode() methods in the object class. This will define how object...read more
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Q4. What is serialisation, externalisation, serializable
Ans. 
Serialisation is the process of converting an object into a format that can be easily stored or transmitted. Externalisation is a way to customize the serialization process. Serializable is an interface in Java that allows objects to be serialized.
• Serialisation is the process of converting an object into a format that can be easily stored or transmitted

• Externalisation is a way to customize the serialization process

• Seri...read more
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Q5. Write a Generic method to add string or integer to List or List
Ans. 
Create a generic method to add string or integer to List or List
• Create a generic method that takes a List and an element as input

• Use Java generics to specify the type of List and element

• Check the type of List and element, then add the element to the List
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