Java利用Callable、Future进行并行计算求和
内容:在Java中利用Callable进行带返回结果的线程计算,利用Future表示异步计算的结果,分别计算不同范围的Long求和,类似的思想还能够借鉴到需要大量计算的地方。
public class Sums { public static class Sum implements Callable<Long> { private final Long from; private final Long to; public Sum(long from, long to) { this.from = from; this.to = to; } @Override public Long call() throws Exception { long ans = 0; for (long i = from; i <= to; i++) ans += i; return ans; } } public static void main(String[] args) throws InterruptedException, ExecutionException { ExecutorService executor = Executors.newFixedThreadPool(2); List<Future<Long>> ans = executor.invokeAll(Arrays.asList( new Sum(0, 1000), new Sum(10000, 100000), new Sum(1000000, 1000000))); executor.shutdown(); long sum = 0; for (Future<Long> i : ans) { long tmp = i.get(); System.out.println(tmp); sum += tmp; } System.out.println("sum : " + sum); } }
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