discovering

[Mihamina Rakotomandimby]

Hi,
I come back to Java for a specific project.

I last used it at school (University), with the Sun's Java and we used 
to install it with the "binary installer" (it was 1.4 in those times).

Now, at work, we use Ubuntus and we want to install them only with the 
package manager.

Ubuntu has openJDK packaged.

All that things to say: I dont really know the history of openJDK.

And I have a question:
What is the compatibility of, for example 
http://java.sun.com/docs/books/tutorial/networking/sockets/clientServer.html 
with openJDK?