arraycopy() appi

/**

* Copies {@code length} elements from the array {@code src},

* starting at offset {@code srcPos}, into the array {@code dst},

* starting at offset {@code dstPos}.

*

* @param src

* the source array to copy the content.

* @param srcPos

* the starting index of the content in {@code src}.

* @param dst

* the destination array to copy the data into.

* @param dstPos

* the starting index for the copied content in {@code dst}.

* @param length

* the number of elements to be copied.

*/

public static native void arraycopy(Object src, int srcPos, Object dst, int dstPos, int length);

中文意思是：

从数组src的第srcPos个元素开始，顺数复制length个元素到数组dst第dstPos个位置处。（原来数组dst第dstPos个位置处以及其后的元素将会安排到新插入的元素之后）