从java中的二维数组流式传输
我正在尝试从 n 维 int 数组中获取 IntStream.有没有很好的 API 方法来做到这一点?我知道两个流的连接方法.
I am trying to get an IntStream out of an n dimensional int arrays. Is there a nice API way to do it?
I know the concatenate method for two streams.
推荐答案
假设您想以行优先方式顺序处理数组数组，这应该可以:
Assuming you want to process array of array sequentially in row-major approach, this should work:
int[][] arr = { {1, 2, 3}, {4, 5, 6}, {7, 8, 9} };
IntStream stream = Arrays.stream(arr).flatMapToInt(x -> Arrays.stream(x));
首先它调用 Arrays.stream(T[])方法，其中T被推断为int[]，得到一个Stream<int[]>，然后是 Stream#flatMapToInt() 方法将每个 int[] 元素映射到一个 IntStream 使用 Arrays.stream(int[]) 方法.
First it invokes the Arrays.stream(T[]) method, where T is inferred as int[], to get a Stream<int[]>, and then Stream#flatMapToInt() method maps each int[] element to an IntStream using Arrays.stream(int[]) method.
相关文章