AT&T Java Developer Interview Questions and Answers

Q1. How to make a new products
Ans. 
To make a new product, conduct market research, identify customer needs, develop a prototype, test it, gather feedback, and iterate.
• Conduct market research to identify gaps in the market and customer needs

• Develop a prototype of the product based on the research findings

• Test the prototype with a focus group or beta testers to gather feedback

• Iterate on the product based on the feedback received to improve its features an
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Q2. How to the growth the company
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Q1. Asking related to java, and good knowledge of Oops concepts
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Q2. Basic java program
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Q1. Asking past project and technology that you are using
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Q2. API related question like rest, sop
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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. Tell me about your self
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Q2. Why you want to change the company
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Q3. Why you left your previous company
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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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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. Reverse a linked list.
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Q2. Merge sort on a array/
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Q1. What are the things that u do when your what app screen is blank
Ans. 
I would check for internet connection, restart the app, clear cache, and update the app.
• Check internet connection

• Restart the app

• Clear cache

• Update the app
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Q2. Simple python code
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