Re: How is tag interface functionality implemented in Java continued ...?

From:

Lew <noone@lewscanon.com>

Newsgroups:

comp.lang.java.programmer

Date:

Sun, 07 Sep 2008 21:35:14 -0400

Message-ID:

<GJqdnYcOl5DOHFnVnZ2dnUVZ_radnZ2d@comcast.com>

ankur wrote:

Read the Javadocs and the question is still not answered.
"The method clone for class Object performs a specific cloning
operation. First, if the class of this object does not implement the
interface Cloneable, then a CloneNotSupportedException is thrown. "

But that *is* the answer!

How is the exception thrown? I am trying to understand by looking at
Java library code how the exception is thrown ??

Got enough question marks there?

I did not(could not) find anything to that effect in Object.java,
Cloneable.java, Exception.java etc !!

The declaration in Object of clone() is:
protected native Object clone() throws CloneNotSupportedException;

The word "native" there tells us that the source code is elsewhere.
A method that is native is implemented in platform-dependent code,
typically written in another programming language such as C, C++,
FORTRAN,or assembly language. The body of a native method is given
as a semicolon only, indicating that the implementation is omitted,
instead of a block.

From the JLS, 8.4.3.4.

--
Lew