$ character in .CLASS files

[aleplgr]

Hi! I need to start to work in a medium-size application (500 classes) that some students have been developing for up to 2 years, the first thing I found is that for each .java file there are many (up to 30) .CLASS with the same name but with a $ and a sequencial number before the extension. For example:

DlgOpcTFreq.jav a
DlgOpcTFreq.cla ss
DlgOpcTFreq$1.c lass
DlgOpcTFreq$2.c lass
DlgOpcTFreq$3.c lass
DlgOpcTFreq$4.c lass
.......
DlgOpcTFreq$24. class
DlgOpcTFreq$25. class

I thought they were temporal files and deleted all of the ...$ files, keeping only the .java and the .class
but now I can't run the program and compile nothing..

And I was asked to delete (or find out what to do) with all those $ files...
Those classes are in some way different than the others, but as I saw they can't be deleted, can they?

[JosAH]

Hi! I need to start to work in a medium-size application (500 classes) that some students have been developing for up to 2 years, the first thing I found is that for each .java file there are many (up to 30) .CLASS with the same name but with a $ and a sequencial number before the extension. For example:

DlgOpcTFreq.jav a
DlgOpcTFreq.cla ss
DlgOpcTFreq$1.c lass
DlgOpcTFreq$2.c lass
DlgOpcTFreq$3.c lass
DlgOpcTFreq$4.c lass
.......
DlgOpcTFreq$24. class
DlgOpcTFreq$25. class

I thought they were temporal files and deleted all of the ...$ files, keeping only the .java and the .class
but now I can't run the program and compile nothing..

And I was asked to delete (or find out what to do) with all those $ files...
Those classes are in some way different than the others, but as I saw they can't be deleted, can they?

Those are the files that contain the compiled anonymous classes. e.g:

[code=java]
public class MyButton extends JButton {
public MyButton() {
// this generates a MyButton$1.clas s file:
this.add(new ActionListener( ) {
public void actionPerformed (ActionEvent ae) { ... }
});
}
}
[/code]

kind regards,

Jos

[aleplgr]

THANKS.
Alright so I'll never ever delete any of those, unless I wanted to re-implement them..

[JosAH]

THANKS.
Alright so I'll never ever delete any of those, unless I wanted to re-implement them..

You can only generate (compile) those $1, $2 ... files if you have the sources
of the surroundig class. The compiler plays a few tricks on us because the jvm
doesn't know about anonymous classes and the compiler synthesizes top level
classes for us just like any other class and names them $1, $2 ... appended to
the name of the outer classes.

kind regards,

Jos