3 minutes to understand the usage of Java in System.arraycopy

System provides a static method arraycopy (), we can use it to implement replication between arrays. Its function prototype is:

public static native void arraycopy(Object src,int srcPos,Object dest, int destPos,int length)；

* @param      src      the source array. 源数组
* @param      srcPos   starting position in the source array. 源数组的起始位置
* @param      dest     the destination array. 目标数组
* @param      destPos  starting position in the destination data. 目标数组的起始位置
* @param      length   the number of array elements to be copied. 复制的长度

For chestnut:

The array array copied to the new array;

int[] array = {1, 2, 3, 4, 5};
int[] targetArr = new int[array.length];
System.arraycopy(array,0,targetArr,0,array.length);