Jio Java Developer Interview Questions and Answers

Oops, singleton, api, array problems, logical part, springboot, hibernate

Q1. Hibernate coding, sessionFactory, git, maven, oops concepts, multithreading, synchronisation, String
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Q2. Introduction about yourself, project flow, why do you want to switch
Ans. 
I am a Java Developer with experience in project flow and looking to switch for new challenges.
• I have been working as a Java Developer for the past 5 years.

• I have experience in developing and maintaining Java applications.

• I am familiar with the project flow and have worked on various stages of software development life cycle.

• I am seeking new opportunities to enhance my skills and work on challenging projects.

• I am looki...read more
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Q1. Sql related ques mege into, rank,dense rank,queries of joins etc.
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Q2. Java 8 related ques optional and stream
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2 programmings on problem solving+ some mcqs on Java + spring boot+ mysql

Q1. Streams question to find the count of integers in a list and return it as 1 : 5, 2 : 3, ..
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Q2. Solid principles + spring theory different questions like jsonignore, pathvaroables, asynchronous communications, normalisation, etc.
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Q3. Questions on core java like oops, final,static, collections, generics
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Q4. Questions on project and each part of your services
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Q1. How to optimise fetching 1 lakh entries from db
Ans. 
Use pagination, indexing, caching, and query optimization to fetch 1 lakh entries efficiently from the database.
• Implement pagination to fetch data in smaller chunks

• Create indexes on columns frequently used in queries

• Use caching to store frequently accessed data

• Optimize queries by avoiding unnecessary joins and using appropriate indexes

• Consider using database-specific optimizations like query hints or stored procedures
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Q1. How to handle exception?
Ans. 
Handle exceptions by using try-catch blocks to gracefully manage errors in code execution.
• Use try-catch blocks to catch exceptions and handle them appropriately.

• Throw custom exceptions when necessary to provide more specific error information.

• Use finally block to execute code that should always run, regardless of whether an exception is thrown.

• Avoid catching generic exceptions like Exception class, instead catch specif...read more
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Q2. What is inheritance?
Ans. 
Inheritance is a concept in object-oriented programming where a class can inherit attributes and methods from another class.
• Allows for code reusability by creating a new class based on an existing class

• Derived class inherits properties and behaviors of the base class

• Supports the 'is-a' relationship, where a derived class is a specialized version of the base class
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Q1. Round 1 is about basic questions on technology
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Q1. Round is about high level design and data structure questions
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It involves 2 problem solving logical questions