java-thread-vs-executor

JDK VERSION : JDK 11 - AMAZON CORRETTO

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Examples

• Thread

  Thread class and Runnable Interface

  Thread sleep & join & priority

  Thread Synchronization

  Thread Deadlock

  Atomic

  Thread wait & notify

  CountDownLatch

  CyclicBarrier

  example code

• Executor Thread Pooling

  Thread Pooling

  Single Thread Pool

  Fixed Thread Pool

  Cached Thread Pool

  Custom Thread Pool

  BlockingQueue & RejectedExecutionHandler & ThreadFactory & Core and Max Pool size & KeepAlive

  example code

• Callable & Future

  Callable & Runnable Object

  Future Object

  example code

• CompletableFuture

  runAsync & supplyAsync method

  thenApply & thenAccept & thenRun & thenCompose

  join & get

  allOf & anyOf

  CompletableFuture with Executor

  Exception with exceptionally method

  Exception with handle method

  example code

• Fork/Join Framework

  RecursiveAction

  RecursiveTask

  example code

  Resources : Rules of ThreadPoolExecutor pool size

Here are Sun's rules for thread creation in simple terms:

If the number of threads is less than the corePoolSize, create a new Thread to run a new task.

If the number of threads is equal (or greater than) the corePoolSize, put the task into the queue.

If the queue is full, and the number of threads is less than the maxPoolSize, create a new thread to run tasks in.

If the queue is full, and the number of threads is greater than or equal to maxPoolSize, reject the task.

The long and the short of it is that new threads are only created when the queue fills up, so if you're using an unbounded queue then the number of threads will not exceed corePoolSize.