Mastering Java for Technical Interviews

Instructor: Richa Sinha

Language: English

Validity Period: Lifetime

₹1699 52% OFF

₹799

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Java Interview Questions – 200+ Q&A to Crack Your Next Interview

From freshers to experienced developers, this is your all-in-one guide to acing Java interviews — with real questions, clear explanations, and expert-level coverage.

Whether you're preparing for your first job or your next big career move, this course gives you access to 200+ carefully curated Java interview questions sourced from real interview experiences at companies like Amazon, Infosys, TCS, Flipkart, and dozens of startups.

We go beyond theory — you’ll understand why certain answers work, what interviewers are really looking for, and how to stand out from other candidates.

What’s Inside the Course:

200+ Interview Questions with deep, easy-to-follow explanations
Full coverage of Core Java, OOPs, Collections, Multithreading, and Java 8–21
Real-world scenarios including backend design, performance tuning, and debugging
Special modules on Spring & Spring Boot, Exception Handling, Memory Management, and Garbage Collection
Includes JUnit & Mockito testing questions
Covers System Design basics, object modeling, and best practices
Suitable for freshers, SDE-1/2, and senior-level interviews

Why You Should Buy This Course:

✅ Real Interview Questions That Matter – From startups to FAANG, get questions that are actually asked
✅ Freshers to Seniors – Role-specific, explanation-driven, and career-stage appropriate
✅ Covers What Interviewers Want – Everything from Core to Concurrency, Java 21, Spring, Design & Testing
✅ Saves You Time – No more endless blog-hopping or YouTube digging. It’s all here.

Who This Is For:

Final-year students & freshers preparing for their first Java role
Developers with 2–10 years of experience applying for backend or Java-based roles
Professionals aiming for product companies, startups, or MNCs
Anyone who wants to revise, polish, and gain confidence before a tech interview

Outcomes You Can Expect:

Build solid Java fundamentals
Confidently answer questions across experience levels
Tackle whiteboard and system design rounds with ease
Leave a strong impression with well-structured, complete answers

This isn’t just a list of questions. It’s a structured roadmap to crack Java interviews — and get the job you want.

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	Core Java
		What is the difference between JDK, JRE, and JVM?
		How does Java achieve platform independence?
		What is the role of the main() method in Java?
		Explain the concept of Object-Oriented Programming in Java.
		What are access modifiers in Java?
		What is method overloading vs. method overriding?
		What is the difference between == and .equals()?
		What are wrapper classes in Java?
		What are autoboxing and unboxing?
		How does garbage collection work in Java?
		What is the difference between final, finally, and finalize()?
		What is the purpose of this keyword?
		Can a constructor be private? Why?
		What is the difference between an abstract class and an interface?
		What is the transient keyword in Java?
		What is a static block and when does it get executed?
		What are enums in Java?
		What are anonymous inner classes?
		What are the memory areas allocated by JVM?
		Explain the difference between String, StringBuffer, and StringBuilder.
	Collections Framework
		What is the Java Collections Framework?
		Difference between List, Set, and Map.
		How does HashMap work internally?
		What is the load factor in a HashMap?
		Difference between HashMap and Hashtable.
		How is LinkedHashMap different from HashMap?
		What is the difference between TreeMap and HashMap?
		What is ConcurrentHashMap and how does it work?
		Explain fail-fast and fail-safe iterators.
		What are the differences between ArrayList and LinkedList?
		How does HashSet work internally?
		What is the difference between Comparable and Comparator?
		What is the role of Collections.unmodifiableList()?
		How do you remove duplicate elements from a list?
		What is the difference between Queue and Deque?
		What is a priority queue in Java?
		What are weak references in collections (WeakHashMap)?
		How does a CopyOnWriteArrayList work?
		What is the difference between Iterator and ListIterator?
		What are NavigableSet and NavigableMap?
	Multithreading & Concurrency
		What is the difference between process and thread?
		What is a daemon thread?
		How do you create a thread in Java?
		What is the lifecycle of a thread?
		What is the difference between synchronized block and method?
		What is a volatile variable in Java?
		What are wait(), notify(), and notifyAll() used for?
		Explain thread starvation and deadlock.
		How can deadlock be avoided in Java?
		What is thread safety? How do you achieve it?
		What are Callable and Future?
		What is the ExecutorService in Java?
		How does ThreadPoolExecutor work?
		What is the difference between ReentrantLock and synchronized?
		What are CountDownLatch and CyclicBarrier?
		What is the Fork/Join framework?
		How does CompletableFuture work?
		What are atomic classes in Java?
		What are the differences between parallel streams and threads?
		Explain Semaphore and its use case.
	Exception Handling
		What is the difference between checked and unchecked exceptions?
		Can you catch multiple exceptions in one catch block?
		What is a custom exception and when would you use it?
		What happens if an exception is not caught?
		How does try-with-resources work?
		What is the purpose of the Throwable class?
		Can you rethrow an exception? How?
		What are suppressed exceptions?
		What is the impact of exceptions on performance?
		Difference between throw and throws.
	Java 8 Features
		What are lambda expressions?
		What is a functional interface?
		What is the @FunctionalInterface annotation?
		What are default and static methods in interfaces?
		What is the Stream API?
		Difference between intermediate and terminal stream operations.
		What is the difference between map() and flatMap()?
		What are method references in Java 8?
		How does Optional work?
		What are collectors in Java Stream API?
		What is Predicate, Consumer, and Function interface?
		How does forEach() work with streams?
		What is lazy evaluation in streams?
		Can you parallelize streams? How?
		How does reduce() work in streams?
	Java 9-21+ Features
		What is the module system introduced in Java 9?
		What are private interface methods?
		What is the var keyword (Java 10)?
		What is the switch expression (Java 14)?
		What are records in Java 14+?
		What are text blocks (Java 13+)?
		What is the difference between records and regular classes?
		What are pattern matching features?
		What is sealed class in Java 15?
		What are virtual threads in Java 21?
	Memory Management & Performance
		How does the JVM manage memory?
		What are heap and stack in Java?
		What are the different memory pools in JVM?
		What is the purpose of a garbage collector?
		Difference between minor GC and major GC.
		What is GC tuning? When do you do it?
		What are memory leaks in Java?
		What is the use of -Xmx and -Xms?
		How can you analyze heap dumps?
		What are soft, weak, and phantom references?
	Java I/O and NIO
		Difference between byte and character streams.
		What are buffered streams and why are they used?
		What is serialization in Java?
		How do you serialize and deserialize an object?
		What is the difference between Serializable and Externalizable?
		What are Java NIO buffers?
		What is the difference between NIO and IO?
		What is a selector in Java NIO?
		What is the purpose of FileChannel?
		How do memory-mapped files work?
	JDBC
		What is JDBC?
		Explain the steps to connect to a database using JDBC.
		Difference between Statement and PreparedStatement.
		What is connection pooling?
		What are batch updates?
		What are SQL injection and how to prevent it?
		How does JDBC handle transactions?
		What is the role of ResultSet?
		What are common JDBC exceptions?
		How do you call stored procedures using JDBC?
	Design Patterns
		What are design patterns?
		Explain Singleton pattern.
		What is Factory Method pattern?
		What is Abstract Factory pattern?
		What is Builder pattern?
		Explain Prototype pattern.
		What is Adapter pattern?
		What is Decorator pattern?
		What is Observer pattern?
		What is Strategy pattern?
		What is Command pattern?
		What is MVC in Java applications?
		What is Dependency Injection?
		Difference between Singleton and Prototype scope in DI.
		What is the use of the Proxy pattern?
	JUnit & Testing
		What is JUnit? How do you write a test case?
		What is the difference between @BeforeEach, @BeforeAll, @AfterEach, and @AfterAll?
		What is mocking?
		What is the difference between JUnit and TestNG?
		What is a parameterized test in JUnit 5?
		How does Mockito work?
		What are assertions in testing?
		What is test coverage and how do you measure it?
		How do you test exceptions in JUnit?
		How do you mock static methods?
	Spring & Spring Boot
		What is Spring Framework?
		Difference between Spring and Spring Boot.
		What is Inversion of Control?
		What is Dependency Injection?
		What is a Spring Bean?
		What is the Spring Bean lifecycle?
		What are scopes in Spring?
		What is the purpose of @Autowired?
		Difference between @Component, @Service, @Repository, and @Controller.
		What is Spring Boot auto-configuration?
		How does Spring handle database access?
		What is Spring Data JPA?
		What is the use of @Transactional?
		What is the role of Spring Security?
		How does Spring Boot handle REST APIs?
	Advanced Topics
		What is reflection in Java?
		What are annotations and how do you create custom annotations?
		What is dynamic proxy in Java?
		What is bytecode and how is it executed?
		How does class loading work in Java?
		What are different types of classloaders?
		What are different types of classloaders?
		What is JNI (Java Native Interface)?
		What is the difference between shallow copy and deep copy?
		How do you implement immutability in Java?
		What is metaprogramming in Java?
	System Design with Java
		How do you design a thread-safe Singleton in Java?
		How would you design a caching system using Java?
		How would you implement a rate limiter?
		How do you design a message queue system in Java?
		How would you handle file uploads and downloads in a Java REST service?
	Common Java Problems & Debugging
		How do you detect and fix memory leaks in Java?
		How do you debug a NullPointerException?
		How to improve the performance of Java applications?
		How do you handle large files in Java efficiently?
		What is OutOfMemoryError and how do you troubleshoot it?
		How to profile Java applications?
		How do you troubleshoot slow performance in a Java web app?
		How to log effectively in Java?
		How do you deal with concurrency bugs?
		What tools do you use for Java debugging?
	Miscellaneous & Best Practices
		What are Java coding best practices?
		How do you write clean and maintainable Java code?
		What are effective Java logging strategies?
		How do you manage configuration in Java applications?
		What are common mistakes Java developers make?
		How do you structure a large Java project?
		What are the principles of effective exception handling?
		What tools do you use for Java development?
		How do you handle environment-specific configurations?
		What are some popular Java libraries every developer should know?

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Mastering Java for Technical Interviews

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