How can I use a thread pool or run tasks on the current thread seamlessly in Java\'s Executor Framework?

Using a Thread Pool with Current Thread in Java Executor Framework

One may wish to configure an ExecutorService in Java to either use a thread pool or run tasks on the current thread seamlessly. A simple solution is to utilize CurrentThreadExecutor, an unconfigurable executor that executes tasks instantly on the current thread.

To implement this approach:

<code class="java">import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

//...

ExecutorService es = threads == 0 ? new CurrentThreadExecutor() : Executors.newThreadPoolExecutor(threads);

// es.execute / es.submit / new ExecutorCompletionService(es) etc</code>

In Java 8, an alternative solution is to use a lambda expression as an executor:

<code class="java">Executor e = Runnable::run;</code>

This lambda executor executes tasks on the current thread, eliminating the need for an explicit executor configuration.

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