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改进这个问题
我在哪里有问题 CompletableFuture 循环中的任务不是并行运行，而是同步运行：

List<List<File>> filesLists = divideArrayIntoChunks(Arrays.asList(filesArray), 10);

        // number of tasks
        int numberOfTasks = filesLists.size();

        List<CompletableFuture<TreeMap<String, HashMap<String, Integer>>>> builderPartsMapFutures = Lists
                .newArrayList();

        for (int i = 0; i < numberOfTasks; i++) {

            List<File> filesList = filesLists.get(i);

            builderPartsMapFutures.add(getCompetableFutureResult(filesList, fileNameAndCharactersAmountMatchersMap,
                    namesElementsMap, namesAndFileNamesMatchingCharactersMap));
        }

        @SuppressWarnings("rawtypes")
        CompletableFuture[] futureResultArray = builderPartsMapFutures
                .toArray(new CompletableFuture[builderPartsMapFutures.size()]);

        CompletableFuture<Void> combinedFuture = CompletableFuture.allOf(futureResultArray);

        combinedFuture.get();

        CompletableFuture<List<TreeMap<String, HashMap<String, Integer>>>> finalResults = combinedFuture.thenApply(
                voidd -> builderPartsMapFutures.stream().map(future -> future.join()).collect(Collectors.toList()));

        finalResults.thenAccept(result -> System.out.println(result));

这是 getCompetableFutureResult() 方法：

public static CompletableFuture<TreeMap<String, HashMap<String, Integer>>> getCompetableFutureResult(
            List<File> filesList, HashMap<String, Integer> fileNameAndCharactersAmountMatchersMap,
            TreeMap<String, ArrayList<String>> namesElementsMap,
            TreeMap<String, Map<String, Integer>> namesAndFileNamesMatchingCharactersMap) {

        return CompletableFuture
                .supplyAsync(() -> buildNamesAndFileNamesWithMatchingCharactersMapForEachChunk(filesList,
                        fileNameAndCharactersAmountMatchersMap, namesElementsMap,
                        namesAndFileNamesMatchingCharactersMap));
    }