用多线程实现归并排序

import java.util.ArrayList;import java.util.Arrays;
public class StreamSort {
    public static void main(String[] args) {        final int[] ints = {6, 5, 4, 3, 2, 1};        final ArrayList<Integer> r = Arrays.stream(ints).boxed().map(v -> {            ArrayList<Integer> result = new ArrayList<>();            result.add(v);            return result;        }).parallel().reduce((left, right) -> {
            ArrayList<Integer> result = new ArrayList<>();            int i = 0, j = 0;            while (i < left.size() && j < right.size()) {                if (left.get(i) <= right.get(j)) {                    result.add(left.get(i++));                } else {                    result.add(right.get(j++));                }            }            while (i < left.size()) {                result.add(left.get(i++));            }            while (j < right.size()) {                result.add(right.get(j++));            }            System.out.println(Thread.currentThread().getName()+left+right);            return result;        }).get();        System.out.println(r);
    }}