Opening file in readonly Editor

Hi all,
how can I open a java file in an editor so that the document is
writeprotected?
I have an Instance of editor but I can't find a show-method.

How can I colorize certain lines in the editor?

thanks!

Harald Ring Am
Kielshof 29
SCOOP GmbH D-51105
K?ln
S o f t w a r e Fon: +49 700 SCOOP GmbH
Entwicklung - Beratung - Bewertung +49 221 801916- 0
+49
221 801916-25