copy array in java
public static void arraycopy(Object source_arr, int sourcePos,
Object dest_arr, int destPos,
int len)
/* Parameters :
source_arr : array to be copied from
sourcePos : starting position in source array from where to copy
dest_arr : array to be copied in
destPos : starting position in destination array, where to copy in
len : total no. of components to be copied
*/