Cognizant Associate Project Engineer Interview Questions and Answers

It had a 2 programs with easy and medium level of coding programs, please go through the recent interview problems asked in wipro

Q1. What is Object oriented programming
Ans. 
Object oriented programming is a programming paradigm based on the concept of objects, which can contain data and code.
• OOP focuses on creating objects that interact with each other to solve problems

• Encapsulation, inheritance, and polymorphism are key principles of OOP

• Examples of OOP languages include Java, C++, and Python
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Q2. What is multi threading
Ans. 
Multi threading is a programming concept where multiple threads within a process execute independently to improve performance.
• Allows for concurrent execution of tasks within a single process

• Improves performance by utilizing multiple CPU cores

• Requires careful synchronization to avoid race conditions

• Examples include web servers handling multiple requests simultaneously
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Q3. Why is java not 100% oop
Ans. 
Java is not 100% OOP because it supports primitive data types and static methods.
• Java has primitive data types like int, double, etc. which are not objects.

• Java allows static methods which do not require an instance of a class to be called.

• Java also has the concept of wrapper classes to convert primitive data types to objects.
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Q4. What are collections in java
Ans. 
Collections in Java are classes and interfaces that provide a way to store and manipulate groups of objects.
• Collections provide dynamic data structures like List, Set, and Map.

• They offer methods to add, remove, and manipulate elements in the collection.

• Examples include ArrayList, LinkedList, HashSet, and HashMap.
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Q5. Internal working of hash map
Ans. 
A hash map is a data structure that stores key-value pairs and uses a hash function to map keys to their corresponding values.
• Hash map uses a hash function to determine the index of the key-value pair in the underlying array.

• Collision resolution techniques like chaining or open addressing are used to handle situations where multiple keys hash to the same index.

• Hash maps typically have O(1) average time complexity for i...read more
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