This example is Perl; it's the standard DirHandle module. I've cut out the code, so you'll have to trust me on the parameters.

ProgramListing version:

package DirHandle;

require 5.000;
use Carp;
use Symbol;

sub new {
}

ClassSynopsis version:

package DirHandle;
@ISA = (superclass1, superclass2);

require 5.000;
use Carp;
use Symbol;

sub new { ... };
sub DESTROY { ... };

This example is IDL from the DOM spec.

ProgramListing version:

interface Element : Node {
  readonly attribute  DOMString            tagName;
  DOMString                 getAttribute(in DOMString name);
  void                      setAttribute(in DOMString name, 
                                         in DOMString value)
                                         raises(DOMException);
};

ClassSynopsis version:

interface Element: Node {

  readonly attribute DOMString tagName ;
  DOMString getAttribute(in DOMString name);
  void setAttribute(in DOMString name, in DOMString value)
    raises(DOMException);
}

 public TextFileWriter extends Superclass1, Superclass2
    implements Interface1, Interface2
    throws Exception1, Exception2 {

  private Writer writer ;
  public String writerName = "MyWriter";
  static public void write(ResultTreeFragment frag,
                           String file)
    throws Exception1, Exception2;
}

class Rectangle_with_data:  virtual Shape, virtual Data_container
{
...
};

ClassSynopsis version:

Rectangle_with_data: virtual Shape, virtual Data_container {

...}