[Ant Wiki] Update of "AntNewbies" by PhilWS

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  This will create the file every time which is not desirable.
  
+ ```Answer#15```
+ 
+ Use the uptodate task and a "timestamp file" (this could even be the ServiceVersion.java file itself) to determine whether any of the generated .class files (excluding ServiceVersion.class) are newer than this "timestamp file" and if so set a property that can be used as a condition on executing a target to re-create the ServiceVersion.java file (updating the "timestamp file" too if a separate file is used).
+ 

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