Java inner classes

Thread view:

Enable EMail Alerts

Start New Thread

Thread rating:

Adam Cameron - 25 Apr 2007 15:38 GMT

G'day
How does one - in CF - refer to an inner class (ClassFoo.Bar) of a given
class (ClassFoo), when the constructor of ClassFoo takes an argument of
type ClassFoo.Bar?

For example the first, third,fourth and fifth constructors shown here:
http://tinyurl.com/hfg9s (org.apache.lucene.document.Field).

Any ideas?

Signature

Adam

Reply to this Message

cf_dev2 - 25 Apr 2007 17:31 GMT

<cfscript>
    bar = createObject("java", "org.apache.lucene.document.Field$Store");
    foo = createObject("java", "org.apache.lucene.document.Field");
    foo.init(name, byte, bar.COMPRESS);
</cfscript>

Reply to this Message

Adam Cameron - 26 Apr 2007 11:31 GMT

That did the trick: cheers.

Signature

Adam

Reply to this Message

insuractive - 25 Apr 2007 21:22 GMT

Just out of curiosity - what does the $ represent and is the reason you can't
use another "." because it is not a property of Field? I've never really done
anything with Java inner classes, but this seems like a syntax I'll want to
hang on to for future reference.

Reply to this Message

cf_dev2 - 25 Apr 2007 23:53 GMT

>is the reason you can't use another "." because it is not a property of Field

Thats my understanding, yes.

> what does the $ represent

Its part of the class name. It has to do with how java compiles the classes.
It creates one file for the outer class and one for the inner class. The naming
convention for inner class files is usually
"OuterClassName$InnerClassName.class". So the class name passed to
createObject() becomes

bar = createObject("java", "OuterClassName$InnerClassName");

Reply to this Message

insuractive - 26 Apr 2007 15:48 GMT

Thanks for the illumination, cf_dev2!

Reply to this Message

Webmaster Forum / ColdFusion / Advanced Techniques / April 2007

Java inner classes