Java Reference
In-Depth Information
System.out.printf("Hello at %s \n", new Date());
The class is designed only to mark the passage of time. You'll use the same instance when you
explore Java SE Executor s and Spring's TaskExecutor support:
import java.util.Date;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
public class ExecutorsDemo {
public static void main(String[] args) throws Throwable {
Runnable task = new DemonstrationRunnable();
// will create a pool of threads and attempt to
// reuse previously created ones if possible
ExecutorService cachedThreadPoolExecutorService = Executors
if (cachedThreadPoolExecutorService.submit(task).get() == null)
System.out.printf("The cachedThreadPoolExecutorService "
+ "has succeeded at %s \n", new Date());
// limits how many new threads are created, queueing the rest
ExecutorService fixedThreadPool = Executors.newFixedThreadPool(100);
if (fixedThreadPool.submit(task).get() == null)
System.out.printf("The fixedThreadPool has " +
"succeeded at %s \n",
new Date());
// doesn't use more than one thread at a time
ExecutorService singleThreadExecutorService = Executors
if (singleThreadExecutorService.submit(task).get() == null)
System.out.printf("The singleThreadExecutorService "
+ "has succeeded at %s \n", new Date());
// support sending a job with a known result
ExecutorService es = Executors.newCachedThreadPool();
if (es.submit(task, Boolean.TRUE).get().equals(Boolean.TRUE))
System.out.println("Job has finished!");
// mimic TimerTask
ScheduledExecutorService scheduledThreadExecutorService = Executors
if (scheduledThreadExecutorService.schedule(
task, 30, TimeUnit.SECONDS).get() == null)
System.out.printf("The scheduledThreadExecutorService "
+ "has succeeded at %s \n", new Date());
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