ecs business solutions Interview Questions and Answers

Given 3 questions based on logic

Q1. 3 were there for taking the interview and it is a face to face rounds. Asked more about API testing in depth, jenkins, git, manual testing, agile methodologies, about my projects etc
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Q1. Given a Web app and create a frame work using selenium, they were not prefer pom with or without, so I chose without, created frame work from scratch and automated the test scripts for login page and follo...read more
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Q1. Hr round feels me very bad . They asked more about their product in depth. Like their clients products types etc
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Q1. Skills, Salary,Why job change
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Q1. OOPS Concept, Java Collections, Basics of Java
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Q1. Logical questions
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Q1. What is your explanation of Object-Oriented Programming (OOP) with a real-world example?
Ans. 
OOP is a programming paradigm based on the concept of objects, which can contain data in the form of fields and code in the form of procedures.
• OOP focuses on creating objects that interact with each other to solve complex problems

• Objects have attributes (data) and methods (functions) that operate on the data

• Encapsulation, inheritance, and polymorphism are key principles of OOP

• Example: A car object with attributes like
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Q2. Explain Singleton Design patten
Ans. 
Singleton design pattern ensures a class has only one instance and provides a global point of access to it.
• Singleton pattern restricts the instantiation of a class to one object.

• It provides a way to access the unique instance of the class globally.

• Commonly used in scenarios where only one instance of a class is needed, such as database connections or logging.

• Implementation can be achieved using static variables, lazy i
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Q3. What is the Java Collection Framework?
Ans. 
Java Collection Framework is a set of classes and interfaces that provide various data structures and algorithms to store and manipulate collections of objects.
• Includes interfaces like List, Set, Queue, and classes like ArrayList, LinkedList, HashSet, PriorityQueue

• Provides implementations for common data structures like lists, sets, maps, queues, stacks

• Offers algorithms for searching, sorting, and manipulating collecti...read more
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Q4. What is the difference between an ArrayList and a LinkedList?
Ans. 
ArrayList is implemented as a resizable array, while LinkedList is implemented as a doubly linked list.
• ArrayList provides fast random access and slower insertion/deletion, while LinkedList provides fast insertion/deletion and slower random access.

• ArrayList uses less memory overhead compared to LinkedList.

• Example: ArrayList is more suitable for scenarios where random access is frequent, while LinkedList is more suitable...read more
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Q5. What is the internal working of a HashMap?
Ans. 
HashMap is a data structure that stores key-value pairs and uses hashing to quickly retrieve values based on keys.
• HashMap internally uses an array of linked lists to store key-value pairs.

• When a key-value pair is added, the key is hashed to determine the index in the array where it will be stored.

• If multiple keys hash to the same index, a linked list is used to handle collisions.

• To retrieve a value, the key is hashed a...read more
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Q6. Basic SQL Questions: Explain trigger Difference between primary key and Unique key Type of Join SQL programming question based on joins
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Q7. Different ways to create string in java?
Ans. 
Different ways to create strings in Java include using string literals, the new keyword, and the String class constructor.
• String literals: String str = "Hello World";

• Using new keyword: String str = new String("Hello World");

• String class constructor: char[] charArray = {'H', 'e', 'l', 'l', 'o'}; String str = new String(charArray);
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Q8. Difference between StringBuffer and StringBuilder?
Ans. 
StringBuffer is synchronized and thread-safe, while StringBuilder is not synchronized and faster.
• StringBuffer is synchronized, meaning it is thread-safe and multiple threads can access it at the same time without any issues.

• StringBuilder is not synchronized, making it faster but not thread-safe. It is recommended for single-threaded operations.

• Use StringBuffer when working with multiple threads and synchronization is r...read more
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Q9. MultiThreading related questions
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Q10. Java 8 Features
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Q1. Explain current project
Ans. 
Developing a web application for inventory management system
• Using React for front-end development

• Implementing RESTful APIs with Node.js for back-end

• Utilizing PostgreSQL for database management
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Q2. Questions about multithreading
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Q3. What challenges have you faced on your current project, and how have you handled those situations?
Ans. 
I have faced challenges with integrating a new third-party API and resolving performance issues.
• Integrating a new third-party API required extensive research and testing to ensure compatibility with existing systems.

• Resolving performance issues involved analyzing code, identifying bottlenecks, and implementing optimizations.

• Collaborating with team members to troubleshoot and address issues in a timely manner.

• Prioritizi...read more
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Q4. Hobbies
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Normal aptitude test with four sections

Q1. There will be 3 to 4 people asking basic to a medium level.
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Q1. Just checks your communication skills and situation handling
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