Written Exam Question set for a Java & React JS Fullstack Senior Software Engineer role

Here’s a comprehensive written exam question set for a Java & React JS Fullstack Senior Software Engineer role. The exam is divided into four sections: Java, React JS, Fullstack, and General. Each section includes both multiple-choice and short-answer questions.

Java Section

Multiple Choice Questions:

1. What are the main principles of Object-Oriented Programming (OOP)?
   1. Encapsulation, Polymorphism, Abstraction, Inheritance
   2. Encapsulation, Modularity, Abstraction, Concurrency
   3. Encapsulation, Polymorphism, Composition, Inheritance
2. Which method in Java is used to compare the values of two objects?
   1.  ==
   2.  equals()
   3.  compareTo()
3. What is the output of the following code snippet?

int a = 10;
int b = 20;
System.out.println(a + b * 2);

1.  30
2.  50
3.  40

Short Answer Questions:

1. Explain the difference between ArrayList and LinkedList in Java.
2. What is the purpose of the final keyword in Java?
3. How do you handle exceptions in Java?

React JS Section

Multiple Choice Questions:

1. What is the purpose of the key prop in React?
   1.  To uniquely identify elements in an array
   2.  To style elements
   3.  To optimize re-rendering of elements
2. Which hook is used to manage state in a functional component?
   1.  useEffect
   2.  useState
   3.  useRef
3. How does React handle rendering when state changes?
   1.  Re-renders the entire component tree
   2.  Re-renders only the components with changed state
   3.  Re-renders only the root component

Short Answer Questions:

1. Explain what props are in React.
2. How do you create a new component in React?
3. Can you explain what React Hooks are and give an example?

Fullstack Section

Multiple Choice Questions:

1. What is a RESTful API?
   1.  An API that uses HTTP requests for CRUD operations
   2.  An API that uses WebSockets for real-time communication
   3.  An API that uses SOAP for message exchange
2. How do you handle authentication in a fullstack application?
   1.  Using cookies and sessions
   2.  Using JWT tokens
   3.  Both a and b
3. What is the role of CORS in web development?
   1.  To secure the communication between client and server
   2.  To allow restricted resources on a web page to be requested from another domain
   3.  To enable secure cookie exchange

Short Answer Questions:

1. How do you ensure data consistency between the frontend and backend?
2. What are some common security practices for fullstack development?
3. Explain the concept of RESTful APIs and how they are used in fullstack development.

General Section

Multiple Choice Questions:

1. Which version control system is commonly used in software development?
   1.  SVN
   2.  Git
   3.  Mercurial
2. What is Test-Driven Development (TDD)?
   1.  Writing tests after code is written
   2.  Writing tests before code is written
   3.  Writing tests during code review
3. How do you stay updated with the latest trends and technologies in software development?
   1.  Following tech blogs and websites
   2.  Attending conferences and meetups
   3.  Both a and b

Short Answer Questions:

1. Describe a challenging project you worked on and how you overcame the challenges.
2. How do you approach debugging and troubleshooting issues in your code?
3. What are your thoughts on test-driven development (TDD)?

This exam is designed to test the candidate's knowledge and skills across Java, React JS, fullstack development, and general programming principles. Good luck with your hiring process!