Question

Just curious:

Someone knows why the method System.arraycopy uses Object as type for src and dest? Would be perfectly possible to use Object[] instead?

Why define:

arraycopy(Object src, int srcPos, Object dest, int destPos, int length)

instead of

arraycopy(Object[] src, int srcPos, Object[] dest, int destPos, int length)

?

Answer 1

Primitive array types like boolean[] and double[] do not extend Object[] but they do extend Object

This method allows you to copy any type of array, so the type is Object.

int[] a =
int[] b =
System.arraycopy(a, 0, b, 0, a.length);