[antlr-interest] cant install antlr

[OMUYE ELIJAH]

I have win xp on my system and have antlr-2.7.2 and 2.7.5 plus some of their binaries. i've set d classpath and have java running smoothly on my system.
 
On typing java antlr.Tool file.g at the command prompt, it displays
 
   java.lang.noclassdeffound
 
Please, help with installing antlr.


EZAGA ELIJAH OMUYE.

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