Sometimes .java compiles to two class files

[Mythic Wave]

Hello,

Sometimes when I compile a long .java file, I get two class files as a
result. For example, the file servlet.java compiles to servlet.class and
servlet$1.class. Does anyone know why the servlet$1.class file is created
and how to control it?

Thanks,

Brian

(e-mail address removed)

 

[Nicholas Clarke]

Sometimes when I compile a long .java file, I get two class files as a
result. For example, the file servlet.java compiles to servlet.class and
servlet$1.class. Does anyone know why the servlet$1.class file is created
and how to control it?

$1,2... are anonymous inner classes. I doubt you can control it besides
not using inner classes.

-Nicholas

 

[Daniel Cer]

Hello,

Sometimes when I compile a long .java file, I get two class files as a
result. For example, the file servlet.java compiles to servlet.class and
servlet$1.class. Does anyone know why the servlet$1.class file is created
and how to control it?

Thanks,

Brian

It looks like you have an anonymous inner class somewhere in the source file.

Grep for something like

Object someRandomName = new Object() { ...

The 'servlet$1.class' file is just the byte-code for the compiled inner
class.

-Dan

 

[Juha Laiho]

Sometimes when I compile a long .java file, I get two class files as a
result. For example, the file servlet.java compiles to servlet.class and
servlet$1.class. Does anyone know why the servlet$1.class file is created
and how to control it?

It's not the length. It's that you have an anonymous inner class in
your code. If a single source file contains more than one anonymous
inner classes, you'll get Foo$2.class, Foo$3.class, ... .

See:
http://mindprod.com/jgloss/innerclasses.html
http://mindprod.com/jgloss/anonymousclasses.html

 

[Mythic Wave]

Yes, an inner class was there. Thanks.

Brian

 

[Roedy Green]

Sometimes when I compile a long .java file, I get two class files as a
result. For example, the file servlet.java compiles to servlet.class and
servlet$1.class. Does anyone know why the servlet$1.class file is created
and how to control it?

it is typically an anonymous inner class. If you don't like them,
name your classes.