AT&T 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. How to make a new products
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Q2. How to the growth the company
Ans. 
To grow a company, focus on innovation, customer satisfaction, and strategic partnerships to enhance market presence and profitability.
• Invest in employee training and development to enhance skills and productivity.

• Leverage technology to streamline operations and improve efficiency, such as using cloud services.

• Expand product lines or services based on market research to meet customer needs.

• Enhance customer engagement t...read more
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Q1. Tell me about your self.
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Q2. Why do you join in this company.
Ans. 
I am excited to join this company for its innovative projects, collaborative culture, and opportunities for professional growth.
• The company's commitment to cutting-edge technology aligns with my passion for innovation, as seen in your recent AI-driven project.

• I admire the collaborative culture here, which fosters teamwork and knowledge sharing, evident from your employee testimonials.

• The opportunities for professional ...read more
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Q3. What is java
Ans. 
Java is a high-level, object-oriented programming language designed for portability, performance, and ease of use.
• Platform-independent: Write once, run anywhere (WORA) - Java code can run on any device with a Java Virtual Machine (JVM).

• Object-oriented: Supports concepts like inheritance, encapsulation, and polymorphism, making code reusable and modular.

• Rich API: Provides a vast set of libraries for tasks like networkin...read more
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Q4. What is an encapsulation
Ans. 
Encapsulation is a fundamental OOP concept that restricts direct access to an object's data and methods.
• Encapsulation combines data and methods into a single unit called a class.

• It restricts access to the internal state of an object using access modifiers (private, protected, public).

• Example: A class 'BankAccount' may have private fields like 'balance' and public methods like 'deposit()' and 'withdraw()' to manipulate ...read more
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Q5. Difference between python and java.
Ans. 
Java is a statically typed, compiled language, while Python is dynamically typed and interpreted, affecting their syntax and performance.
• Java requires explicit declaration of variable types (e.g., int x = 5;), while Python infers types (e.g., x = 5).

• Java uses a class-based object-oriented model, whereas Python supports multiple programming paradigms, including procedural and functional.

• Java code is compiled into byteco...read more
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Online aptitude test only 30 -45
Questions

2 -3 coding question

Q1. Dbms, java, oops
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Q1. Personality based questions
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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
Ans. Why u want to change
Answered Anonymously
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Q2. API related question like rest, sop
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For freshers there is online aptitude test.

Coding round is done by interviewers on live screen sharing

Q1. Here they discuss about projects and work in depth.
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Q1. Tell me about yourself? What are your hobbies? If you get chance to work with our company what is your expectations from us?
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Q2. Discuss about policies and work culture
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Q1. What is java articheture in java?
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Q2. Java oops concepts
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Q3. What is processor and trigger?
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Q4. What is operator in java
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