| Sr. No. | Key | Scheduled Thread Pool | Single Thread Executor |
|---|
1
| Basic
| Creates a thread pool that can schedule commands to run after a given delay, or to execute periodically.
| Tasks are guaranteed to execute sequentially, and no more than one task will be active at any given time
|
2
| Queue
| It uses Delay Queue to store tasks. Schedule the task based on time delay.
| It uses blocking queue.
|
3
| Thread Lifetime
| T he number of threads to keep in the pool, even if they are idle
| Recreate thread if killed because of the task.
|
4.
| Thread Pool Size
| It always has a single thread running.
| The thread pool can grow from zero threads to Integer.MAX_VALUE
|
5.
| Use Case
| We should used fixedthreadpool, when we wanted to limit the concurrent task
| This type of pool can be used when you want to ensure that Task1 should always run before task2.
|
Example of ScheduledThreadPool
public class ScheduledThreadPoolExample {
public static void main(String args[]) {
ScheduledExecutorService services = Executors.newScheduledThreadPool(10);
services.schedule(new Task(), 10, TimeUnit.SECONDS);
services.scheduleAtFixedRate(new Task(), 15, 10, TimeUnit.SECONDS);
//(new Thread(new Main())).start();
}
}
public class Task implements Runnable {
@Override
public void run() {
System.out.println("In Run");
}
}Example of SingleThreadExecutor
public class Main {
public static void main(String args[]) {
ExecutorService services = Executors.newSingleThreadExecutor();
Future<?> future = services.submit(new Task());
}
}
public class Task implements Runnable {
@Override
public void run() {
System.out.println("In Run");
}
}
