Neustar Software Developer Interview Questions and Answers

Q1. What is HashMap?
Ans. 
HashMap is a data structure that stores key-value pairs and provides constant time complexity for basic operations.
• HashMap allows quick access to values based on their keys

• Keys must be unique and values can be duplicated

• HashMap is not thread-safe and requires synchronization for concurrent access

• Java's HashMap implementation uses hashing to distribute keys across buckets
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Q2. It’s a collection framework.
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Basic maths and quant

For me it was cyber crime

Q1. Oops java dbms coa
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Q1. General question
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Q1. 2 coding question
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Aptitude test on amcade platform logical reasoning verbal and quantitative aptitude and Java mcqs and English listening and speaking.

GD was about remote jobs is good or bad

Q1. Based on resume ,oops and projects
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Q1. Opps Concept , in depth Related to java Collections and Some puzzle problems
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Q2. Explain and Write a Code of Compile and Run time polymorphism
Ans. 
Compile-time polymorphism is achieved through function overloading, while run-time polymorphism is achieved through virtual functions.
• Compile-time polymorphism is achieved through function overloading, where multiple functions have the same name but different parameters.

• Run-time polymorphism is achieved through virtual functions and inheritance, where the function to be called is determined at runtime based on the obje...read more
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Q3. Some tricky questions about oops and inheritance
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Q1. Introduce ur self
Ans. 
I am a passionate software developer with experience in Java, Python, and web development.
• Experienced in Java, Python, and web development technologies

• Strong problem-solving skills

• Familiar with Agile methodologies

• Worked on projects involving database management systems
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Q1. General resume discussions
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Q2. HR questiosn aslso
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2 DSA question was asked

40 questions in 20 minutes

Q1. Stones games 2 leetcode
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Q2. Permutations of array
Ans. 
Generate all possible permutations of an array of strings
• Use recursion to generate permutations

• Swap elements to create different permutations

• Base case: when array size is 1, return array as permutation
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Q1. Project discussion
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