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02: 5 Java multithreading scenarios interview

Java interview questions & answers on multithreading scenarios to judge your experience in building applications with concurrency in mind. Q1. Can you give some scenarios where you built concurrent systems? A1. In a concurrent system different threads run concurrently, … Read more ›...



03: 7 Things you must know about Java locks and synchronized key word

7 Things you must know about Java locks and synchronized key word summarizes the key basics. #1. Each Java class and object (i.e. instance of a class) has an intrinsic lock or monitor. Don’t confuse this with explicit lock utility class that were added in Java 1.5, … Read more...



04: 6 popular Java multithreading interview Q&As for the experienced

Q1. Why do threads need to communicate with each other? A1. Inter thread communication is very similar to inter process communication where 2 or more processes communicate with other, the only difference being that inter thread communication happens within the same process (i.e. within the same memory model). … Read...



05: 9 Java multithreading Q&As on concepts like blocking, sequencing, preempting, time slicing & daemon threads

Java multithreading Q&As on concepts like blocking, and debugging blocked threads. How do you sequence threads? what do you understand by the term preemptive scheduling? Q1. What are the different ways a Java thread gets blocked or suspended? How will you debug Java threading issues? A1. … Read more ›...



06: 10+ Atomicity, Visibility, and Ordering interview Q&A in Java multi-threading

Q1. Why is it important to understand the difference between the “JVM memory model” and the computer “hardware memory model”? A1. 3 reasons why it is important to understand the JVM memory model and computer hardware memory model are: 1) JVM memory model and the physical hardware memory model architectures...



07: Java FP – CompletableFuture monadic chaining with examples – part 1

This extends Future Vs. CompletableFuture interview Q&As with Java 8 functional programming (i.e. FP). Q1. Why was CompletableFuture introduced in Java 8 when you already had the Future interface? A1. The CompletableFuture implements both CompletionStage<T> and Future<T> … Read more ›...



07: Java ThreadLocal Interview questions & answers

Java ThreadLocal Interview questions & answers in detail with code focusing more on when to use it and how to not abuse it. Q1. What is a ThreadLocal class? When to use it? How to not abuse it? A1. … Read more ›...



08: 7 basic Java Executor framework Interview Q&As with Future & CompletableFuture

Basic level Java Executor framework Interview Q&As with Future & CompletableFuture (introduced in Java 8), which you would be using very often in Java apps. Q01. What is an Executor Framework? A01.In Java 5, Executor framework was introduced with the java.util.concurrent. … Read more ›...



08: CompletableFuture monadic chaining with examples – part 2

This extends Java FP – CompletableFuture monadic chaining with examples – part 1. f and g are processed asynchronously, and then combined A “Supplier” returns a result by taking nothing as an argument. “CompletableFuture.supplyAsync” executes a “Supplier” without blocking. This means executes it asynchronously. … Read more ›...



09: Java FutureTask example

Java 5 introduced the concurrent package for more efficient multi-threading.

Q. What is the difference between Future and FutureTask in asynchronous processing?
A. Future is the interface and FutureTask is the base implementation of the Future with methods to start and cancel a computation.

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10: ExecutorService Vs Fork/Join & Future Vs CompletableFuture Interview Q&As

Q1. What is the difference between “ExecutorService” and “Fork/Join Framework“?
A1. The Fork/Join framework uses a special kind of thread pool known as the ForkJoinPool, which is a specialized implementation of ExecutorService implementing the 1) work-stealing algorithm,

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14: Java Thread stop, resume, suspend & interrupt interview Q&As

Q1. Why are Thread.stop, Thread.suspend and Thread.resume deprecated? A1. We already learnt that “In Java programming, each object has a lock. A thread can acquire the lock for an object by using the synchronized keyword.” “The JVM uses locks in conjunction with monitors. … Read more ›...



15+ Java beginner multithreading interview Q&As

Q1. What is a thread?
A1. It is a thread of execution in a program. The JVM (i.e. process) allows an application to have multiple threads of execution running concurrently. In the Hotspot JVM there is a direct mapping between a Java Thread and a native operating system (i.e.

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