想要在java中从char数组创建一个字符流 [英] Want to create a stream of characters from char array in java

问题描述

从char数组中，我想构建一个流来使用java 8等功能，例如过滤器和地图。

From a char array, I want to construct a stream to use java 8 features such as filters and maps.

char[] list = {'a','c','e'};
Stream<Character> cStream = Stream.of(list);
// Stream<Character> cStream = Arrays.stream(list);

第一种方法不起作用（原因：将cStream更改为 Stream< char []> ）。
注释行也不起作用（原因：Arrays类型中的方法 stream（T []）不适用于参数（ char [] ））。

The first method does not work (Reason: change cStream to Stream<char[]>). The commented line does not also work (Reason: The method stream(T[]) in the type Arrays is not applicable for the arguments (char[])).

我知道如果 char [] list 更改为 int [] ，使用 IntStream ，一切正常。但是我不希望每次将每个 char [] 转换为 int [] ，或者当我改为列表时需要在 char 数组上使用流库。

I know that if char[] list is changed to int[], everything works fine using IntStream. But I do not want to convert every char[] to int[] each time or change into a list when I need to use stream library on char array.

推荐答案

您可以使用 IntStream 生成索引，然后按 mapToObj ：

You can use an IntStream to generate the indices followed by mapToObj:

char[] arr = {'a','c','e'};
Stream<Character> cStream = IntStream.range(0, arr.length).mapToObj(i -> arr[i]);

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