3Pillar Global Java Developer Interview Questions and Answers

Q1. Experience in past proyects
Ans. 
I have worked on various projects ranging from web development to mobile app development, gaining experience in different technologies and frameworks.
• Developed a web application using React.js and Node.js for a client in the e-commerce industry

• Created a mobile app using Flutter for a startup in the travel sector

• Collaborated with a team to implement a machine learning algorithm for data analysis in a research project
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Q2. Experience leading a group of develeopers
Ans. 
Led a team of developers on a project to develop a new software application.
• Managed a team of 5 developers to ensure project deadlines were met

• Assigned tasks to team members based on their strengths and expertise

• Held regular team meetings to discuss progress and address any issues

• Provided guidance and support to team members when needed

• Collaborated with other departments to gather requirements and feedback
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Q1. It was more like a talk about your experience
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Q2. Code test to create a small search enginee
Ans. 
Code test to create a small search engine
• Create a function that takes a search query and an array of strings as input

• Iterate through the array of strings to find matches with the search query

• Return an array of strings that contain the search query
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It was combination of mcqs and 2 coding questions

Q1. What is oops concepts
Ans. 
Object-oriented programming concepts that focus on objects and classes for better code organization and reusability.
• Encapsulation: Bundling data and methods that operate on the data into a single unit (class).

• Inheritance: Ability of a class to inherit properties and behavior from another class.

• Polymorphism: Ability to present the same interface for different data types.

• Abstraction: Hiding the complex implementation det...read more
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Q2. Difference between java nd putjon
Ans. 
Java is a programming language while Putjon is not a recognized term in software development.
• Java is a widely used programming language for developing applications.

• Putjon is not a recognized term in software development, it may be a typo or a specific term not commonly used.

• There is no direct comparison between Java and Putjon as they are not related.
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Q3. Tell about ur project
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Q1. What are your strengths
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Q2. What is ur greatest comeback
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Medium level leetcode question

Q1. Explain about your project
Ans. 
Developed a web application for managing inventory and sales for a retail store.
• Used React.js for front-end development

• Implemented RESTful APIs using Node.js and Express for back-end

• Utilized MongoDB for database management

• Incorporated authentication and authorization features for secure access
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Q2. Explain functionalities in detail
Ans. 
Functionalities in software development refer to the specific tasks or actions that a software program can perform.
• Functionalities are the specific features or capabilities of a software program.

• They define what the software can do and how it can be used.

• Examples of functionalities include user authentication, data encryption, and file management.

• Functionalities can be implemented through code modules or libraries.

• Test...read more
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Hackertank Test containing dsa question

Q1. Define success for you
Ans. 
Success for me is achieving personal and professional goals while maintaining a healthy work-life balance.
• Achieving personal goals such as learning new technologies or completing a project

• Receiving positive feedback from colleagues or clients

• Maintaining a healthy work-life balance by setting boundaries and taking time for self-care

• Feeling fulfilled and satisfied with my work
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Q2. Why changing your job
Ans. 
Seeking new challenges and opportunities for growth in a different environment.
• Looking for a new challenge to expand my skills and knowledge

• Interested in exploring different technologies and industries

• Seeking better career advancement opportunities

• Wanting to work in a more collaborative team environment
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Coding test was medium to hard leetcode problems.

Q1. I was asked about pascals triangle and basic questions from oops, dbms, SQL, networking and other topics.
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Q1. Linked list (detect loop, reverse, delte a node) tree (height, DFS) graph theory concept C++ basic questions
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Q1. Total 3 round of Technical interviews.
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Round duration - 60 minutes
Round difficulty - Easy

The second round is also written but you need to write programming based on their concept.

Q1. 
Prime Numbers Identification
Given a positive integer N, your task is to identify all prime numbers less than or equal to N.
Explanation:
A prime number is a natural number greater than 1 that has no po...read more
Ans. 
The naïve approach for this question is to run a loop from the start to the end number. And for each number, check if it is prime or not. If the number is prime, we print it otherwise skip it.

One optimization to this approach would be to skip all even numbers (except 2 if present in interval) since even numbers are not prime.
Function to check if a number is prime or not :
isPrime(n):
if (n <= 1) return false
for (i=2;
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Q2. 
Palindrome String Validation
Determine if a given string 'S' is a palindrome, considering only alphanumeric characters and ignoring spaces and symbols.
Note:
The string 'S' should be evaluated in a case...read more
Ans. 
The idea is to create a copy of num and recursively pass the copy by reference, and pass num by value. In the recursive calls, divide num by 10 while moving down the recursion tree. While moving up the recursion tree, divide the copy by 10. When they meet in a function for which all child calls are over, the last digit of num will be ith digit from the beginning and the last digit of copy will be ith digit from the end
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Round duration - 60 minutes
Round difficulty - Easy

Technical round with questions mainly on Java and OOPS concepts.

Q1. What is the difference between static methods and instance methods in Java?
Ans. 
Instance method can access the instance methods and instance variables directly.
Instance method can access static variables and static methods directly.
Static methods can access the static variables and static methods directly.
Static methods can’t access instance methods and instance variables directly. They must use reference to object. And static method can’t use this keyword as there is no instance for ‘this’ to ref
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Q2. What is the difference between an abstract class and an interface in Java?
Ans. 
1) Abstract class can have abstract and non-abstract methods. Interface can have only abstract methods. Since Java 8, it can have default and static methods also.
2) Abstract class doesn't support multiple inheritance. Interface supports multiple inheritance.
3) Abstract class can have final, non-final, static and non-static variables. Interface has only static and final variables.
4) Abstract class can provide the implem...read more
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Q3. What is the difference between ClassNotFoundException and NoClassDefFoundError in Java?
Ans. 
1. As the name suggests, ClassNotFoundException is an exception while NoClassDefFoundError is an error.
2. ClassNotFoundException occurs when classpath does not get updated with required JAR files while error occurs when the required class definition is not present at runtime.
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Q4. What is the difference between an Error and an Exception in Java?
Ans. 
1 Type : 
Error : Classified as an unchecked type 
Exception : Classified as checked and unchecked 
2 Package :
Error : It belongs to java.lang.error 
Exception : It belongs to java.lang.Exception 
3 Recoverable/ Irrecoverable : 
Error : It is irrecoverable
Exception : It is recoverable
4 Error : It can't be occur at compile time 
Exception : It can occur at run time compile time both 
5 Ex...read more
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Q5. What is SerialVersionUID in Java?
Ans. 
The serialization at runtime associates with each serializable class a version number called a serialVersionUID, which is used during deserialization to verify that the sender and receiver of a serialized object have loaded classes for that object that are compatible with respect to serialization.
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Q6. What are the requirements for creating an immutable class in Java?
Ans. 
Following are the requirements: 

The class must be declared as final so that child classes can’t be created.
Data members in the class must be declared private so that direct access is not allowed.
Data members in the class must be declared as final so that we can’t change the value of it after object creation.
A parameterized constructor should initialize all the fields performing a deep copy so that data members can...read more
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