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Explanation

ExecutorService is a framework in Java
used to manage and control thread execution asynchronously.

Code:

ExecutorService executor = Executors.newFixedThreadPool(2);
executor.submit(() -> System.out.println("Task executed"));
executor.shutdown();

Explanation

ExecutorService helps in reusing threads
from a pool
instead of creating new threads manually.

Code:

ExecutorService executor =
Executors.newSingleThreadExecutor();
executor.execute(() ->
System.out.println(Thread.currentThread().getName()));
executor.shutdown();

Explanation

submit() method returns a Future object
which can be used to get the result of a
task.

Code:

ExecutorService executor =
Executors.newSingleThreadExecutor();
Future<Integer> result = 
executor.submit(() -> 10 + 20);
System.out.println(result.get());
executor.shutdown();

Explanation

shutdown() initiates an orderly shutdown
where previously submitted tasks are executed.

Code:

executor.shutdown();

Explanation

shutdownNow() attempts to stop all
actively executing tasks immediately.

Code:

executor.shutdownNow();