Is System.arraycopy safe when the source and destination are the same array?

最新推荐文章于 2022-01-25 11:24:56 发布

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最新推荐文章于 2022-01-25 11:24:56 发布

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文章标签： java python 开发工具

原文链接：https://my.oschina.net/u/2935389/blog/3033012

本文通过一个具体的Java示例展示了如何使用System.arraycopy方法来高效地完成数组内的元素复制操作，并解释了当源数组和目标数组相同时的具体行为。

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/***
 *  From java doc: If the src and dest arguments refer to the same array object,
 *  then the copying is performed as if the components at positions srcPos through
 *  srcPos+length-1 were first copied to a temporary array with length components
 *  and then the contents of the temporary array were copied into positions destPos
 *  through destPos+length-1 of the destination array
 */
public class ArraycopyTest {

    public static void main(String args[]) {
        int[] scores = {1, 2, 3, 4, 5, 6};
        System.arraycopy(scores, 2, scores, 3, 3);
        for (int i : scores)
            System.out.print(i);
    }
}

It‘s safe

转载于:https://my.oschina.net/u/2935389/blog/3033012