Developers often need to create custom executors to run tasks in parallel. In this article, we'll explore how to do this in Java.
The first step in creating a custom executor is to create a thread pool. This can be done using the Executors
class:
ExecutorService executor = Executors.newFixedThreadPool(10);
This will create a thread pool with 10 threads. You can also use the Executors
class to create a single-threaded executor:
ExecutorService executor = Executors.newSingleThreadExecutor();
Once you have an executor, you can submit tasks to it for execution. For example, let's say you have a Runnable
task:
Runnable task = () -> {
// task logic here
};
You can submit this task to the executor for execution using the submit()
method:
executor.submit(task);
If you have a Callable
task, you can submit it using the submit()
method as well:
Callable<T> task = () -> {
// task logic here
return result;
};
Once you are finished executing tasks, you will need to shutdown the thread pool. This can be done using the shutdown()
method:
executor.shutdown();
If you want to shutdown the thread pool immediately, you can use the shutdownNow()
method:
executor.shutdownNow();