Multithreading is one of the important features of Java, and multithreading interview Q&As can reveal a lot about your depth of core Java knowledge. Most importantly, it is not easy to grasp multithreading concepts without lots of hands-on experience. Let’s start with the beginner basics & then get into Java concurrency management interview Q&As for the experienced.
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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,
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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...
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...
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 ›...
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...
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 ›...
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 ›...
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 ›...
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 ›...