Raja Software Labs Java Developer Interview Questions and Answers

Aptitude test

Current affairs

Q1. Puzzle , sql related questions
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Used an online IDE and asked general DS Algo questions

Q1. System Design HLD question to make URL shortener
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Q1. General HR Aptitude questions
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Online assessment with quantitative and qualitative questions

Some Tree traversal coding question

Q1. Load balancer design question
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Q2. Technical challenges faced
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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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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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3 basic coding question about recursion, string manipulation and queues

Q1. HR and tech round included in one for me. Brief about myself.
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Q2. Question about Android development.
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3 Question based on strings, array & LinkedList

Q1. Sql queries & RDBMS Concepts Java core Collection Complexity Pattern program
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Q1. Linked list Map Arraylist Sql Jvm Acid properties
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Q1. Why you want to join Skills What is your best handled situation
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