How to invoke @GET method from client side

[Bhallamudi Venkata Siva Kamesh]

Hi
  I have built one application in server side like this

@GET("json")
 void methodname(){---}
@GET("xml")
 void methodname(){---}

>From client side how to invoke @GET("json") and @GET("xml") so the 
>corresponding representation client receives.

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