ExecutorService

ExecutorService is an interface which allows us to execute tasks on thread asynchronously

Instantiating

ExecutorService executorService1 = Executors.newSingleThreadExecutor(); 
//Creates a ExecutorService object having a single thread.  
    
ExecutorService executorService2 = Executors.newFixedThreadPool(10); 
// Creates a //ExecutorService object having a pool of 10 threads.  
    
ExecutorService executorService3 = Executors.newScheduledThreadPool(10); 
//Creates a scheduled thread pool executor with 10 threads. 
//In scheduled thread pool, we can schedule tasks of the threads.

Assigning Tasks

//We can use the following methods
execute(Runnable task)
submit(Runnable task) / submit(Callable<T> task)
invokeAny(Collection<? extends Callable<T>> tasks)
invokeAll(Collection<? extends Callable<T>> tasks);

Shutting down

We can use the following methods after we're done. If we don't, the threads will keep running and JVM won't shut down.

• shutdown() method
• shutdownNow() method
• awaitTermination() method

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Backlinks

• Multithreading (cs)