Chemin conceptions Interview Questions and Answers

Q1. Explain the difference between ArrayList and LinkedList in Java. When would you choose one over the other?
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Q2. What are the advantages and disadvantages of using Java’s synchronized keyword for thread synchronization? Can you explain how the ReentrantLock compares to synchronized?
Ans. 
Java's synchronized keyword offers thread safety but has limitations compared to ReentrantLock.
• Advantages of synchronized: Simple to use, built-in language feature.

• Disadvantages of synchronized: Can lead to deadlocks, less flexible than ReentrantLock.

• ReentrantLock allows for tryLock() method, enabling non-blocking attempts to acquire a lock.

• ReentrantLock supports fairness policies, allowing threads to acquire locks in ...read more
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Q3. What is the difference between == and .equals() in Java? When should each be used, and what issues can arise from improper usage?
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Q4. How does the Java garbage collector work? Can you describe the different types of garbage collection algorithms available in Java?
Ans. 
Java's garbage collector automatically manages memory by reclaiming unused objects, improving performance and preventing memory leaks.
• Java uses automatic garbage collection to manage memory, freeing developers from manual memory management.

• The main types of garbage collection algorithms in Java include: Serial, Parallel, Concurrent Mark-Sweep (CMS), and G1 (Garbage-First).

• The Serial Garbage Collector is simple and suit...read more
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Q5. What are the main features of Java 8? Can you explain how lambdas and the Stream API have changed the way Java applications are written?
Ans. 
Java 8 introduced lambdas, Stream API, and other features that enhance functional programming and simplify code.
• Lambdas: Enable concise representation of functional interfaces. Example: (x, y) -> x + y.

• Stream API: Facilitates functional-style operations on collections. Example: list.stream().filter(x -> x > 10).collect(Collectors.toList()).

• Default Methods: Allow adding new methods to interfaces without breakin...read more
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Q6. Describe the differences between checked and unchecked exceptions in Java. Provide examples and explain how to handle them properly.
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Q7. What is the Java Memory Model, and how does it affect multithreading and synchronization? How does volatile help ensure memory visibility?
Ans. 
The Java Memory Model defines how threads interact through memory, ensuring visibility and ordering of shared variables.
• The Java Memory Model (JMM) specifies how threads interact with memory, ensuring consistency and visibility.

• It defines rules for visibility, atomicity, and ordering of operations in a multithreaded environment.

• Without proper synchronization, threads may see stale or inconsistent data due to caching an...read more
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Q8. Can you explain the difference between method overloading and method overriding in Java? Provide examples where each should be used.
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Q1. How much previous knowledge you have on topic.
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Q2. What your plan to learn after preceding with company.
Ans. 
After joining the company, I plan to enhance my skills through hands-on projects, mentorship, and continuous learning opportunities.
• Hands-On Projects: I aim to work on real-world projects to apply theoretical knowledge and gain practical experience, such as contributing to team initiatives.

• Mentorship: I plan to seek guidance from experienced colleagues to learn best practices and industry standards, enhancing my profes...read more
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Q1. Spark architecture.
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Q2. Narrow and wide transformations
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Q1. Normal introduction was asked
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Q2. Description of the previous role
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Q3. Roles and responsibilities
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Not applicable , this was final round