Programowanie współbieżne w języku Java

Cached Executor oraz zadanie typu Callable.
package thp02;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
public class ThreadPoolTest {
public static void main(String[] args) {
int numWorkers = Integer.parseInt(args[0]);
ExecutorService tpes = Executors.newCachedThreadPool();
CallableWorkerThread[] workers = new
CallableWorkerThread[numWorkers];
Future futures[] = new Future[numWorkers];
for (int i = 0; i < numWorkers; i++) {
workers[i] = new CallableWorkerThread(i);
futures[i] = tpes.submit(workers[i]);
}
for (int i = 0; i < numWorkers; i++) {
try {
System.out.format("Ending worker: %d%n", futures[i].get());
} catch (Exception e) {
System.err.println(e.getMessage());
}
}
tpes.shutdown();
}
}
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package thp02;
import java.util.concurrent.Callable;
public class CallableWorkerThread implements Callable{
private int workerNumber;
CallableWorkerThread (int number) {
workerNumber = number;
}
}
public Integer call(){
for (int i = 0; i