Quantiphi Analytics Solutions Private Limited Senior Software Developer Interview Questions and Answers

Q1. Why functional interface when we have interface
Ans. 
Functional interfaces provide a single abstract method for functional programming in Java.
• Functional interfaces allow for lambda expressions and method references to be used as instances of the interface.

• Interfaces with multiple abstract methods cannot be used for lambda expressions.

• Example: java.util.function.Function is a functional interface with a single abstract method apply().
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Q2. Java 8 explain all features in short
Ans. 
Java 8 introduced new features like lambda expressions, streams, functional interfaces, and default methods.
• Lambda expressions: Allows writing concise code by enabling functional programming.

• Streams: Provides a way to work with sequences of elements efficiently.

• Functional interfaces: Interfaces with a single abstract method, used for lambda expressions.

• Default methods: Allows adding new methods to interfaces without br
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Q3. If one functional interface can extend another interface
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Yes, one functional interface can extend another interface in Java.
• Functional interfaces can extend other functional interfaces in Java.

• The child interface can have only one abstract method, but can inherit default methods from the parent interface.

• Example: interface Parent { void method1(); } interface Child extends Parent { void method2(); }
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Q1. Array based basic easy level questions
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Q2. Reverse an array
Ans. 
Reverse an array of strings
• Use a loop to iterate through half of the array

• Swap the elements at the corresponding positions from both ends

• Continue swapping until the middle of the array is reached
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Q3. Find the second largest element in an array
Ans. 
Find the second largest element in an array
• Sort the array in descending order and return the element at index 1

• Iterate through the array and keep track of the largest and second largest elements

• Use a priority queue to find the second largest element
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Q1. Oops, entity, sql, api
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Q2. Azure, good, bad, challenge
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Q1. Javascript basics, class and functional components, basic es6
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Q1. Promises, context api, redux and rest API
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Hello tell me about yourself

Q1. Find frequency of characters in any string
Ans. 
Use a hashmap to store character frequencies in a string.
• Iterate through the string and update the hashmap with character frequencies.

• Return the hashmap with character frequencies.
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Q2. Difference between webseries and Api
Ans. 
Webseries is a series of videos released online, while API is a set of rules and protocols for building and interacting with software applications.
• Webseries is a collection of videos released online, often in episodes or seasons.

• API (Application Programming Interface) is a set of rules and protocols that allows different software applications to communicate with each other.

• Webseries are typically consumed by viewers fo...read more
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