Executor is a simple interface in Java that defines a single method
execute(Runnable command) for executing a task in a background thread. It is the simplest interface for asynchronous processing of tasks.
On the other hand,
ExecutorService is a more powerful interface that extends
Executor. It provides more advanced features like task scheduling, task cancellation, and returning the result of a task.
ExecutorService interface defines a variety of methods for submitting tasks for execution, such as
invokeAll(). It also provides methods for controlling the lifecycle of the executor, such as
One important thing to note is that while
ExecutorService are related, they are not interchangeable.
Executor is a lower-level interface that is typically used by libraries or framework developers, while
ExecutorService is a higher-level interface that is typically used by application developers.
In general, you should use
ExecutorService when you need more advanced features like task scheduling or returning the result of a task, and use
Executor when you only need to execute a task in the background without any additional features.