Having the following wiki markup in a Confluence page:

{code}
public class helloWorld
{
    coding.......
}
{code}

Will render the following:

public class helloWorld
{
    coding.......
}

Generate the current page to PDF format provides the attached result, PDF_260.pdf (generated from a Confluence version 2.6.0 instance).
The full wiki markup from the attached PDF are:

{code}
public class helloWorld
{
   coding.....
}
{code}

\{noformat}
text
    some more text
\{noformat}

some text

   Some text 

This is also reproducible in Confluence version 2.6.1 and 2.6.2. Note that the panel that shipped together with the macros are gone too.