Nexgile Technologies Java Developer Interview Questions and Answers

Q1. Array manipulatio code wap
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Q2. String reverse wap
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Q1. What is kafka? how to implement it
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Kafka is a distributed streaming platform used for building real-time data pipelines and streaming applications.
• Kafka is designed to handle high-throughput, fault-tolerant, and scalable real-time data streams.

• It uses topics to categorize data streams, producers publish messages to topics, and consumers subscribe to topics to process messages.

• Kafka can be implemented using Kafka APIs in Java, Scala, or other programming...read more
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Q2. What is Oauth and what is use of it?
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OAuth is an open standard for access delegation, commonly used as a way for Internet users to grant websites or applications access to their information on other websites but without giving them the passwords.
• OAuth allows users to grant access to their information on one site to another site without sharing their credentials.

• It is commonly used for authentication and authorization in APIs.

• OAuth uses tokens to access re...read more
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Q1. Data structures Core java Spring boot Hibernate
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Q1. Oops, Interfaces, Exception Handling, Collections, SQL, etc
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Q2. Coding Question - Find 2nd largest element in array with least time complexity
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Find the 2nd largest element in an array with the least time complexity.
• Sort the array in descending order and return the element at index 1.

• Initialize two variables to keep track of the largest and second largest elements.

• Iterate through the array and update the variables accordingly.

• Return the second largest element.
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Q1. Coding Question - print * matrix
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Q2. HashMap, HashSet, Spring, Spring Framework, Microservices, etc
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Q1. Basic Details, CTC Info
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Q2. Tech Stack, Challenges Faced in career
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The codinds questions were too easy.

Q1. Cover the OOPS, Exception Handling, Collections,Arrays, Strings
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Basic aptitude is not hard and not to easy

Q1. Asked questions from C,Java,DS basic questions
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Q2. What is linked lists,what is multiple inheritance,what is compiler and interpreter and where they both are used
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Linked lists are data structures where each element points to the next element. Multiple inheritance is when a class inherits from more than one parent class. A compiler translates source code into machine code, while an interpreter executes code line by line.
• Linked lists are used to store data in a linear sequence, with each element pointing to the next one.

• Multiple inheritance allows a class to inherit attributes and...read more
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Q3. They show some codes and we need to explain that code clearly with correct output
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18 non technical MCQ question with Aptitude, English

Q1. Check Palindrome
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A palindrome is a word, phrase, number, or other sequence of characters that reads the same forward and backward.
• Create a function to check if a given string is a palindrome.

• Remove all non-alphanumeric characters and convert the string to lowercase before checking.

• Compare characters from both ends of the string to determine if it is a palindrome.
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Q2. Compare the object using Instance of Keyword
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Instance of keyword is used to compare an object to a specified class type.
• Instance of keyword returns true if the object is an instance of the specified class.

• It can be used to check if an object is of a specific class type before casting.

• Example: if(obj instanceof String) { // do something }
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Q3. Method overloading and Method Overriding program
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