尝试使用Doug Lea的fork / join框架：
public class MergeSort extends RecursiveAction { final int[] numbers; final int startPos, endPos; final int[] result; private void merge(MergeSort left, MergeSort right) { int i=0, leftPos=0, rightPos=0, leftSize = left.size(), rightSize = right.size(); while (leftPos < leftSize && rightPos < rightSize) result[i++] = (left.result[leftPos] <= right.result[rightPos]) ? left.result[leftPos++] : right.result[rightPos++]; while (leftPos < leftSize) result[i++] = left.result[leftPos++]; while (rightPos < rightSize) result[i++] = right.result[rightPos++]; } public int size() { return endPos-startPos; } protected void compute() { if (size() < SEQUENTIAL_THRESHOLD) { System.arraycopy(numbers, startPos, result, 0, size()); Arrays.sort(result, 0, size()); } else { int midpoint = size() / 2; MergeSort left = new MergeSort(numbers, startPos, startPos+midpoint); MergeSort right = new MergeSort(numbers, startPos+midpoint, endPos); coInvoke(left, right); merge(left, right); } }}
