Java中有memcpy（）吗？ [英] Is there an equivalent to memcpy() in Java?

问题描述

我有一个byte []并希望将其复制到另一个byte []中。也许我在这里显示我的简单'C'背景，但在Java中的字节数组上是否有等效的memcpy（）？

I have a byte[] and would like to copy it into another byte[]. Maybe I am showing my simple 'C' background here, but is there an equivalent to memcpy() on byte arrays in Java?

推荐答案

您可以尝试 System.arraycopy 或使用 数组 类如 java.util.Arrays.copyOf 。两者都应该为您提供原生性能。

You might try System.arraycopy or make use of array functions in the Arrays class like java.util.Arrays.copyOf. Both should give you native performance under the hood.

Arrays.copyOf可能有利于提高可读性，但仅在java 1.6中引入。

Arrays.copyOf is probably favourable for readability, but was only introduced in java 1.6.

 byte[] src = {1, 2, 3, 4};
 byte[] dst = Arrays.copyOf(src, src.length);
 System.out.println(Arrays.toString(dst));

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