连接两个int [] [英] Concatenating two int[]

问题描述

通过<$ c $连接两个 String [] 或 Integer [] 的简单解决方案C>流。由于经常使用 int [] 。是否有任何直接的方法来连接两个 int [] ？

There are easy solutions for concatenating two String[] or Integer[] in java by Streams. Since int[] is frequently used. Is there any straightforward way for concatenating two int[]?

以下是我的想法：

int[] c = {1, 34};
int[] d = {3, 1, 5};
Integer[] cc = IntStream.of(c).boxed().toArray(Integer[]::new);
Integer[] dd = Arrays.stream(d).boxed().toArray(Integer[]::new);
int[] m = Stream.concat(Stream.of(cc), Stream.of(dd)).mapToInt(Integer::intValue).toArray();
System.out.println(Arrays.toString(m));

>>
[1, 34, 3, 1, 5]

它有效，但实际上将 int [] 转换为 Integer [] ，然后转换 Integer [] 再次返回 int [] 。

It works, but it actually converts int[] to Integer[], then converts Integer[] back to int[] again.

推荐答案

您可以与<$ c一起使用 IntStream.concat $ c> Arrays.stream 在没有任何自动装箱或拆箱的情况下完成此操作。以下是它的外观。

You can use IntStream.concat in concert with Arrays.stream to get this thing done without any auto-boxing or unboxing. Here's how it looks.

int[] result = IntStream.concat(Arrays.stream(c), Arrays.stream(d)).toArray();

请注意 Arrays.stream（c）返回 IntStream ，然后在收集到数组之前与其他 IntStream 连接。

Note that Arrays.stream(c) returns an IntStream, which is then concatenated with the other IntStream before collected into an array.

这是输出。

[1,34,3,1,5]

[1, 34, 3, 1, 5]

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