Netcracker Technology 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. 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. Spring boot and microservices
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Q2. Commonly used functional interfaces in your app.
Ans. 
Commonly used functional interfaces include Predicate, Consumer, Supplier, and Function.
• Predicate: used for boolean-valued functions of one argument.

• Consumer: used for operations that take in one argument and return no result.

• Supplier: used for operations that take no arguments and return a result.

• Function: used for operations that take in one argument and return a result.
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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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Q1. Tell me about your self
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Q2. What are the technical skill
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Q1. How many years of experience in Python?
Ans. 
I have 5 years of experience in Python.
• 5 years of hands-on experience in Python programming

• Proficient in developing web applications, data analysis, and automation scripts using Python

• Familiar with popular Python libraries and frameworks such as Django, Flask, and NumPy
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Q2. What is the difference between List and Tuple?
Ans. 
List is mutable, Tuple is immutable in Python.
• List can be modified after creation, Tuple cannot be modified.

• List is defined using square brackets [], Tuple is defined using parentheses ().

• Example: list_example = [1, 2, 3], tuple_example = (1, 2, 3)
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Q3. What is lambda function?
Ans. 
A lambda function is a small anonymous function defined using the lambda keyword in Python.
• Lambda functions can take any number of arguments, but can only have one expression.

• They are commonly used as a way to create small, throwaway functions.

• Lambda functions are often used in conjunction with functions like map(), filter(), and reduce().
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Q4. What are the Data types used in your project?
Ans. 
The data types used in the project include integers, strings, floats, and booleans.
• Integers are used for storing whole numbers, such as IDs or quantities.

• Strings are used for storing text data, such as names or descriptions.

• Floats are used for storing decimal numbers, such as prices or measurements.

• Booleans are used for storing true/false values, such as status indicators.
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Q5. Write a code having square of a series which is divisible by 3 using lambda function ?
Ans. 
Code to find square of series divisible by 3 using lambda function.
• Create a list of numbers in the series

• Use filter() function with lambda function to filter numbers divisible by 3

• Use map() function with lambda function to find square of each number
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Took assignment on react, nodejs, git

Q1. Asked question from my personal project like if we use asyn/await why you have use that? what the functionality
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