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Lesson 10 - Multithreading in Java - ThreadPool

Java Threads Multithreading in Java - ThreadPool

In the previous lesson, Multithreading in Java - Runnable, Callable, Future, Executo, we introduced basic interfaces for parallel programming. Today, we're going to look at their implementations.

ThreadPool

Java threads correspond 1:1 to operating system threads. The operating system also takes care of thread planning. If we keep creating new threads uncontrollably, we can very quickly run into a situation where the application ends up running out of memory. This is because creating a new thread is a relatively "expensive" operation. When a new thread is created, all these items has to be created as well:

  • program counter (instruction pointer)
  • registry contents
  • stack
  • planning properties
  • and other overhead...

For this reason, there are


 

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In this tutorial, we'll introduce advanced techniques for parallel programming in Java. We'll describe the term ThreadPool.

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