问题
Java's standard libraries seem to use camelCase for method names. Native functions like nanoTime() are no exceptions.
If so, why is System.arraycopy not camelCased?
Is there something special about System.arraycopy?
回答1:
It's been in Java for before v1.0 was released - so my guess is that it predates the naming conventions, and it was missed in a sweep of the API when the naming conventions were decided.
(In other news, NullPointerException should be called NullReferenceException.)
来源：https://stackoverflow.com/questions/8421103/why-is-system-arraycopy-not-camelcased