why does a variable be bracketted in double @val@!Thank you

[ibmzz]

I have download a open-source coded in Java from sourceforge websit,
There are some source code like this

public final static int CURRENT_OPTIMIZATION = @optimizationLevel@;
public final static int OBJECT_ACTIVITY_TIMEOUT = @oectActivityTimeout@;
if (@waitForTransactions@ == true) {
setupShutdownHook();
}
why does a variable a bracked in double ·@·，what does this mean? I have used java for coding few month, please give some advice,Thank you

[tim]

Hello ibmzz. Welcome to the forums!

I did a Google search and I found that the @ symbol, pronounced AT (Annotation Type) is used in Java for annotations. It serves as important documentation for the users of the code and the compiler. Read this interesting article that I found:
Annotations (The Java™ Tutorials > Learning the Java Language > Classes and Objects)
One of our members, roots, like to use annotations in his/her code. Maybe he/she can teach us a thing or two about them.

[wsaryada]

Just a guess, I think that this @varName@ notation is used in the code because the owner of the code want to find-and-replace the value "@varName@" later on using a build script such as ant.

[ibmzz]

Mr. wsaryada,Thank you for you giving me some advices about the problem of @valname@.
It is no question , this must be the ant compiling parameters, I am a junior for java coding. if I use ant utilities to build java programm even a very simple one just like "Hello world"(only have a input and output) the hello.java is writtinig like this:
class Hello {
public static void main(String args[]){
String inVal = @inputVal@;
System.out.println("This is the ant built reflect:"+inVal);
}
}
How can i use Eclipse to built the program with the ant utilities?
Would you mind giving me some advices about this?(my target is wo remove the syntex error in Eclipse IDE , and make it runnable )