java 并发计算数组和的示例

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//java 并发计算数组和的示例

public class DemoTest {public static void main(String[] args) throws Exception {sumCalculate();    }  static class Calculate implements Callable<Integer> {int[] a;public Calculate() {}public Calculate(int[] a) {this.a = a;}public Integer call() throws Exception {// TODO Auto-generated method stubint sum = 0;for (int i = 0; i < a.length; i++) {sum += a[i];}return sum;}}public static void sumCalculate() throws InterruptedException, ExecutionException {int core = Runtime.getRuntime().availableProcessors();int[] nums = {1,2,3,4,5,6,7,8,9,12,13,14};double ceil = Math.ceil(nums.length / (core*1.0));ExecutorService pool = Executors.newFixedThreadPool(core);List<FutureTask<Integer>> tasks = new ArrayList<FutureTask<Integer>>();for (int i = 0; i < core; i++) {int[] a = new int[(int) ceil];for (int j=0;j<ceil;j++){if(i*(int)ceil+j >= nums.length) break;a[j]=nums[i*(int)ceil+j];};Calculate calculate = new Calculate(a);FutureTask<Integer> task = new FutureTask<Integer>(calculate);Future<?> submit = pool.submit(task);System.out.println(submit.getClass());tasks.add(task);}int sum = 0;for (int i = 0; i < tasks.size(); i++) {FutureTask<Integer> futureTask = tasks.get(i);Integer integer = futureTask.get();sum += integer;}System.out.println(sum);}}

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