The only guide you’ll need on concurrency & multithreading for senior engineers. Pressure test your skills with real-world practice problems from top companies.

Concurrency in Java is one of the most complex and advanced topics brought up during senior engineering interviews. Knowledge of concurrency and multithreading can put interviewees at a considerable advantage. This course lays the foundations of advanced concurrency and multithreading and explains concepts such as Monitors and Deferred Callbacks in depth. It also builds simple and complete solutions to popular concurrency problems that can be asked about in interviews like the Reader-Writer Problem and the Dining Philosopher Problem. While prior knowledge of concurrency is not required to follow through with this course, familiarity with the very basics of concurrency would be helpful.

Java Multithreading for Senior Engineering Interviews

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# Overview
The `AtomicLongArray` is equivalent of the `AtomicIntegerArray` for the long type. You’ll observe several similarities between the two classes.

The class `AtomicLongArray` represents an array of type `long` that can be updated atomically. We can use long when the range of values we want to represent falls outside the range of values for an integer. An instance of the `AtomicLongArray` can be constructed either by passing an existing array of `long` or by specifying the desired size to the constructors of `AtomicLongArray`. The `long` data type is a 64-bit signed two's complement integer, which has a minimum value of -263 and a maximum value of 263-1. In Java SE 8 and later, `Long` class can be used to represent an unsigned 64-bit long, which has a minimum value of 0 and a maximum value of 264-1.

One notable difference between an ordinary array of `long`-s and an `AtomicLongArray` is that the latter provides volatile access semantics for its array elements, which isn’t supported for ordinary arrays.

# Example
The code widget below demonstrates constructing an instance of `AtomicLongArray` and the various operations possible on it. Comments have been added to explain the various operations.

The Basics

Multithreading in Java

Java's Memory Model

Interview Practice Problems

Bonus Questions

Beyond the Interview

Java Concurrency Reference

Revision & Quizzes

AtomicLongArray

Overview