Xyz Company Senior Java Developer Interview Questions and Answers

There is coding test consists of Easy / Medium DSA Question on Array/String/Hashing

Q1. Java 8 Feature, Immutable, OOPS, Hashmap Internal, Exception Handling, Multthreading lots of Qs asked( Synchonization , Lock ), Collection Framework, Singleton DP.
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Q1. Project Discussion, Spring Boot Microservice related FAQ, @Transactional, Qualifier, JPA related Question, Design APIs for a given Use Case & Apply Authentication & Authorization, SOLID Design Principles
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Q1. Explain Latest Project Architechture, asked Cross Question why RDBMS database , why not NoSQL DB used, How OAuth works/ how API Security implemented in your project, Explain any recent Prod Issue you have ...read more
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Q1. 1. Eager , Lazy Singleton Design Pattern. 2. Java 8 Stream , Functions (Predicate , Supplier , Consumer ) , Comparator Chaining 3. Designing Pattern -> Count Like / Seen any Post of Instagram , Reduce N/W...read more
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Q1. Write an API to fetch the id and JSON from the client.
Ans. 
Create an API to fetch id and JSON from the client.
• Create a RESTful API endpoint that accepts requests from the client

• Use a GET request to fetch the id and JSON data from the client

• Implement error handling for invalid requests or missing data
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Q2. Find forth highest salary from List using java 8.
Ans. 
Use Java 8 stream to find the forth highest salary from a List.
• Use stream() method to convert the List to a stream.

• Use distinct() method to remove duplicates.

• Use sorted() method to sort the salaries in ascending order.

• Use skip() method to skip the first three highest salaries.

• Use findFirst() method to get the forth highest salary.
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Q1. Microservice Architecture questions
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Q2. Spring Boot Annotations
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Q1. Salary Expectation
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Q2. Basic HR questions
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Q1. Project Architecture
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Q1. Informatica tech questions
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MCQ test consisting of 70 mcqs in 75 minutes from aptitude english and cs fundamentals. If cleared next paper 2 coding qs medium level

Q1. Two sum leetcode problem
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Q2. What problems you faced in your project
Ans. 
I faced challenges with integrating third-party APIs and debugging complex logic.
• Difficulty in understanding and implementing third-party APIs

• Issues with data synchronization between different systems

• Troubleshooting complex logic errors

• Managing dependencies and version conflicts

• Time constraints affecting problem-solving
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DP graphs strings it was good

Q1. Reverse a linkded list
Ans. 
Reverse a linked list by changing the direction of pointers
• Start with three pointers: current, previous, and next

• Iterate through the list, updating pointers to reverse the direction

• Return the new head of the reversed list
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Q2. Print fibonacci series
Ans. 
The Fibonacci series is a sequence of numbers where each number is the sum of the two preceding ones.
• Start with two variables initialized to 0 and 1

• Loop through desired number of iterations, adding the previous two numbers to get the next number

• Print or store each number in the series
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