摘自:http://caterpillar.onlyfun.net/Gossip/JavaGossip-V2/CallableFuture.htm
package onlyfun.caterpillar;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.Callable;
public class PrimeCallable implements Callable<int[]> {
private int max;
public PrimeCallable(int max) {
this.max = max;
}
public int[] call() throws Exception {
int[] prime = new int[max + 1];
List<Integer> list = new ArrayList<Integer>();
for (int i = 2; i <= max; i++)
prime[i] = 1;
for (int i = 2; i * i <= max; i++) {
if (prime[i] == 1) {
for (int j = 2 * i; j <= max; j++) {
if (j % i == 0)
prime[j] = 0;
}
}
}
for (int i = 2; i < max; i++) {
if (prime[i] == 1) {
list.add(i);
}
}
int[] p = new int[list.size()];
for (int i = 0; i < p.length; i++) {
p[i] = list.get(i).intValue();
}
return p;
}
}
package onlyfun.caterpillar;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.FutureTask;
public class FutureDemo {
public static void main(String[] args) {
Callable<int[]> primeCallable = new PrimeCallable(1000);
FutureTask<int[]> primeTask = new FutureTask<int[]>(primeCallable);
Thread t = new Thread(primeTask);
t.start();
try {
Thread.sleep(5000);
if (primeTask.isDone()) {
int[] primes = primeTask.get();
for (int prime : primes) {
System.out.print(prime + " ");
}
System.out.println();
}
} catch (InterruptedException e) {
e.printStackTrace();
} catch (ExecutionException e) {
e.printStackTrace();
}
}
}