如何以相反的顺序对IntStream进行排序 [英] How to sort an IntStream in reverse order

问题描述

我正在使用 BufferedReader 从.txt文件中读取数字。我想颠倒这种蒸汽中元素的顺序，这样当它们被收集时，它们将从最高到最低排列。我不想在构建数组之后进行排序，因为我不知道它中可能有多少个元素，我只需要最多的N个元素。

I'm reading in numbers from a .txt file using BufferedReader. I want to reverse the order of elements in this steam so that when they are collected they will be arranged from the highest to the lowest. I don't want to sort after the array has been built because I have no idea how many elements might be in it, I only need the highest N elements.

in = new BufferedReader(reader);
                int[] arr = in.lines()
                        .mapToInt(Integer::parseInt)
                        .sorted()
                        .limit((long) N)
                        .toArray();

推荐答案

在排序和否定之前尝试否定值（返回正常）排序后：

Try negating the values before sorting and negating (back to normal) after sorting:

in = new BufferedReader(reader);
int[] arr = in.lines()
              .mapToInt(Integer::parseInt)
              .map(i -> -i).sorted().map(i -> -i)
              .limit((long) N)
              .toArray();

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