Zoom Video Communications Software Engineer 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?
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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?
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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?
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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?
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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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Q9. What are functional interfaces in Java? How do they work with lambda expressions? Provide an example of a custom functional interface.
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Q10. What is a Java Stream, and how does it differ from an Iterator? Explain how Streams can be used to process collections efficiently.
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Q11. Explain the concept of immutability in Java. How does the String class achieve immutability, and what are the advantages of immutable objects?
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Q12. What is the difference between final, finally, and finalize in Java? Provide examples to illustrate their usage.
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Q13. Explain the Singleton design pattern in Java. How can you implement it safely to ensure thread safety?
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Q14. What are Java annotations, and how are they used in frameworks like Spring? Explain the difference between built-in and custom annotations.
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Q15. How do Java Streams handle parallel processing? What are the potential pitfalls of using parallel streams, and how can they be mitigated?
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Q16. Explain the difference between ArrayList and LinkedList in Java. ArrayList is implemented as a dynamic array, while LinkedList is a doubly linked list. ArrayList provides fast random access (O(1) complexi...read more
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Q17. What are the advantages and disadvantages of using Java’s synchronized keyword for thread synchronization? The synchronized keyword ensures that only one thread can access a block of code at a time. It pr...read more
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Q18. What is the difference between == and .equals() in Java? == checks for reference equality, meaning it compares memory addresses. equals() checks for value equality, which can be overridden in user-defined...read more
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Q19. How does the Java garbage collector work? Garbage collection in Java automatically reclaims memory occupied by unused objects. The JVM has different types of GC algorithms, including Serial, Parallel, CMS...read more
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Q20. What are the main features of Java 8? Java 8 introduced lambda expressions, enabling functional-style programming. The Stream API allows efficient data processing with map, filter, and reduce operations. ...read more
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Q1. Questions from java
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Q2. Questions from basic CS Topics,aptitude
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Questions were on basic arrays and strings

Q1. Personality assessment round
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There are 2 coding questions came in round 1 with time duration of 1 hr. Coding question is related with bitwise operator,array,string

Q1. Tell me about your self
Ans. 
I am a passionate software engineer with 5 years of experience in developing web applications using various technologies.
• Experienced in full stack web development

• Proficient in languages such as JavaScript, Python, and Java

• Familiar with frameworks like React, Node.js, and Django

• Strong problem-solving and analytical skills

• Excellent communication and teamwork abilities
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Q2. Tell me about your Project
Ans. 
Developed a web application for tracking personal fitness goals and progress
• Used React.js for front-end development

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

• Utilized MongoDB for database management

• Incorporated chart.js for visualizing progress data
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Q3. What is Strength
Ans. 
Strength is the ability to overcome challenges and obstacles, both physically and mentally.
• Physical strength refers to the ability to exert force or lift heavy objects.

• Mental strength involves resilience, determination, and the ability to stay focused under pressure.

• Strength can also refer to emotional resilience and the ability to cope with difficult situations.

• Examples: Weightlifters demonstrate physical strength, wh...read more
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Q4. Tell about your weakness?
Ans. 
I tend to be overly critical of my own work, which can sometimes lead to perfectionism.
• I have a tendency to spend too much time on a task to ensure it is perfect

• I struggle with delegating tasks to others because I want to make sure they are done correctly

• I am working on finding a balance between striving for excellence and accepting that perfection is not always attainable
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Q5. Journey of collage
Ans. 
My journey through college was filled with challenges, growth, and memorable experiences.
• Started as a freshman with excitement and nervousness

• Balanced academics, extracurricular activities, and social life

• Learned to manage time effectively and prioritize tasks

• Participated in internships and projects to gain practical experience

• Graduated with valuable skills and knowledge for my career
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