想从java中的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

从一个字符数组，我想构造一个流来使用 java 8 的特性，比如过滤器和映射.

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改为Stream).注释行也不起作用(原因:数组类型中的方法 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[])).

我知道如果将 char[] list 更改为 int[]，使用 IntStream 一切正常.但是我不想每次都将每个 char[] 转换为 int[] 或在需要在 char数组.

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，后跟 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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