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AT&T Full Stack Developer Interview Questions and Answers
AT&T Full Stack Developer Interview Experiences
1 interview found
Anonymous
(2 Questions)
- Q1. Difference between streams and parallel streams
- Ans.
Streams process elements sequentially, while parallel streams process elements concurrently.
Streams process elements one by one in a sequential manner.
Parallel streams process elements concurrently, potentially utilizing multiple threads for faster processing.
Streams are suitable for smaller datasets or when order matters.
Parallel streams are more efficient for larger datasets or when order is not important.
Example: St...
- Q2. What is Static keyword in Java do?
- Ans.
Static keyword in Java is used to create class-level variables and methods that can be accessed without creating an instance of the class.
Static variables are shared among all instances of a class.
Static methods can be called without creating an object of the class.
Static keyword can be used to initialize a variable only once.
Example: public static int count = 0;
Interview Preparation Tips
Skills evaluated in this interview
Top trending discussions
Interview questions from similar companies
(3 Questions)
- Q1. Tell me about your self
- Q2. Why you want to change the company
- Q3. Why you left your previous company
Interview Preparation Tips
I applied via Company Website and was interviewed in Aug 2022. There were 2 interview rounds.
Oops, singleton, api, array problems, logical part, springboot, hibernate
(2 Questions)
- Q1. Hibernate coding, sessionFactory, git, maven, oops concepts, multithreading, synchronisation, String
- 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...
Interview Preparation Tips
Selected
I applied via Walk-in and was interviewed in Jun 2023. There were 5 interview rounds.
For freshers there is online aptitude test.
Coding round is done by interviewers on live screen sharing
(1 Question)
- Q1. Here they discuss about projects and work in depth.
(2 Questions)
- Q1. Tell me about yourself? What are your hobbies? If you get chance to work with our company what is your expectations from us?
- Q2. Discuss about policies and work culture
Java Developer Interview Questions & Answers
Ericsson
Mudimudugu Praveen Kumar
posted on 14 May 2025
Selected
I appeared for an interview in Apr 2025, where I was asked the following questions.
- Q1. Tell me about your self.
- Q2. Why do you join in this company.
- Q3. What is java
- Q4. What is an encapsulation
- 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...
Selected
I applied via Naukri.com and was interviewed before Nov 2022. There were 3 interview rounds.
(2 Questions)
- Q1. Asking related to java, and good knowledge of Oops concepts
- Q2. Basic java program
- Ans.
A basic Java program typically includes a class definition, a main method, and simple output statements.
Java programs start with a class definition: 'public class MyProgram {}'
The main method is the entry point: 'public static void main(String[] args) {}'
Use 'System.out.println()' to print output: 'System.out.println("Hello, World!");'
Java is case-sensitive, so 'System' and 'system' are different.
Every Java program mus...
(2 Questions)
- Q1. Asking past project and technology that you are using
- Ans. Why u want to change
- Q2. API related question like rest, sop
Abhishek Verma
Selected
I applied via Campus Placement and was interviewed before Mar 2023. There were 4 interview rounds.
Online aptitude test only 30 -45
Questions
2 -3 coding question
(1 Question)
- Q1. Dbms, java, oops
(1 Question)
- Q1. Personality based questions
Interview Questionnaire
3 Questions
- Q1. The questions primarily started with discussion on my internships and minor project
- Q2. Many questions were asked about OOPs concepts like virtual function, multiple inheritance, function overloading etc you are supposed to define and implement all of them on paper
- Q3. I was asked about my favorite subject, opted computer networks. So, was asked about computer networks basics like ISO OSI, virtual LANs, QoS, AdHoc networks, WiiMax and Wifi
Interview Preparation Tips
Experience: Technical continues for about 35 minutes, the questions primarily started with discussion on my internships and minor project.
Many questions were asked about OOPs concepts like virtual function, multiple inheritance, function overloading etc you are supposed to define and implement all of them on paper.
I was asked about my favorite subject, opted computer networks. So, was asked about computer networks basics like ISO OSI, virtual LANs, QoS, AdHoc networks, WiiMax and Wifi.
Round: HR Interview
Experience: I was primarily asked about my family background, likes, hobbies etc
College Name: NA
Interview Questionnaire
7 Questions
- Q1. Array sorting – Bubble sort and its complexity?
- Ans.
Bubble sort is a simple sorting algorithm that repeatedly steps through the list, compares adjacent elements and swaps them if they are in the wrong order.
Bubble sort has a worst-case and average complexity of O(n^2), where n is the number of items being sorted.
It is not efficient for large lists and is generally used for educational purposes.
Example: Sorting an array of strings in alphabetical order using bubble sort.
- Q2. Various storage classes in C? Difference between auto, static?
- Ans.
Auto and static are two storage classes in C. Auto variables are local to a function while static variables retain their value between function calls.
Auto variables are created when a function is called and destroyed when the function ends
Static variables are initialized only once and retain their value between function calls
Auto variables have garbage value if not initialized while static variables are initialized to ...
- Q3. Questions on Pointers, memory management, scope of variables, etc were asked
- Q4. What are your strengths and weaknesses?
- Q5. Where do you see yourself 5 years from now?
- Q6. What are your interests?
- Q7. Are you ready to relocate?
- Ans.
Yes, I am open to relocation for the right opportunity.
I am willing to relocate for the right job opportunity
I am open to exploring new cities and cultures
I am willing to consider relocation assistance
I am excited about the prospect of working in a new environment
Interview Preparation Tips
Experience: The written test had 75 questions and we were allotted 80 minutes for the same.There were four sections: Verbal, Analytical, Attention to Detail and Technical (C and Data Structures).First, there was the verbal section. Basically, questions on articles, synonyms and antonyms were asked. Two passages were also given and related questions were asked. The analytical section included questions from quant (set theory, data sufficiency, cubes,etc.) and Logical Reasoning.
The third section was the easiest and did not require any special preparation. From a group of patterns, we had to determine if they were alike or different.
The fourth was the technical section and had 5 questions each from C and DS. This was the toughest section.Time management is absolutely important. There were sectional cutoffs and so we had to clear each section.
Round: Technical Interview
Experience: It was the PI round. First, we had the technical interview. Various questions on C and Data Structures were asked.Next, we had the HR interview. Here, the usual questions were asked. Some of them were:
Round: HR Interview
Experience: Also, questions from what I had written in my CV were asked.On the whole, the interview went quite well. And finally, I was selected.
Skills: Algorithm, C, C++
College Name: NIT PATNA
Skills evaluated in this interview
Interview Questionnaire
8 Questions
- Q1. Basic coding question from C, Data Structures and DBMS
- Q2. Questions from java and C++ (as it was mentioned in the resume)
- Q3. The main point of concentration was projects and training
- Q4. Some people were also asked questions related to data communication and basic electronics
- Q5. Questions like ‘Tell me about yourself’. (Try to create a good impression)
- Q6. Questions on your personality. Show confidence while answering. The HR might try to oppose what you say and see how you react
- Q7. Standard puzzles?
- Q8. Questions like, ‘Why do you want to join Verizon?’, ‘Why should we hire you?’
Interview Preparation Tips
Experience: Consisted of Quantitative aptitude, Logical reasoning, Data Interpretation and English.(Time management is important)
Skills: C, C++, Data structure, Algorithm
College Name: na
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