Java concurrency

Java concurrency utilities are used to make a program fast, reliable, easy to maintain and are simpler to debug. With concurrency utilities, a developer does not need to develop a standard class.


Java concurrency utilities are classes used as building blocks in building concurrent classes or applications. Using it to implement a concurrent application makes a program short, fast, easier to write, read and maintain.

Java concurrency utilities simplify the development of concurrent classes by providing implementations of building blocks.

The new Java concurrency utilities have:

  • High-performance
  • Thread pool
  • Framework for Asynchronous execution of tasks
  • Collection Classes optimized for Concurrent Access
  • Synchronization Utilities
  • Atomic Variables
  • Locks
  • Condition Variables

Advantages of Concurrency utilities:

  • With Java Concurrency utilities, it is very easy to programs as you don't need to develop a standard class, just use it.
  • The implementations in the concurrency utilities are faster and more scalable than a typical implementation.
  • Developers can easily understand and maintain programs that use standard library classes.
  • Concurrent applications are simpler to debug.

The changes and improvement in Java Concurrency Utilities:

  • fork/join framework is added to run various tasks using a pool of worker threads and multiple processors. Class ForkJoinPool extends AbstractExecutorService and implements Executor interface, only difference being work-stealing.

A "work-stealing" technique keeps all the worker threads busy as every thread tries to find and execute subtasks created by other active tasks.

  • ThreadLocalRandom class uses pseudo-random numbers to end competition among threads
  • Phaser class is a new synchronization barrie

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Java concurrency

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