\name{OmegahatReference}
\alias{$.OmegahatReference}
\alias{[[.OmegahatReference}
\alias{[[<-.OmegahatReference}
\alias{print.OmegahatReference}
\title{Accessing Java classes, methods and field}
\description{

  The \code{$} methods allow one to invoke Java methods in the form
  % 
  \code{jobj$methodName(arg1,arg2,....)}
  %
  The \code{[[} methods allow access to class fields as
  %
  \code{jobj[["fieldName"]]}
  % 
  \code{jobj[["fieldName"]] <- value}

}
\usage{
\method{$}{OmegahatReference}(obj, name)
\method{[[}{OmegahatReference}(x, name, ...)
\method{[[}{OmegahatReference}(x, name, ...) <- value
\method{print}{OmegahatReference}(x, ...)
}
\arguments{
  \item{obj}{A reference to the Java object.}
  \item{x}{A reference to the Java object.}
  \item{name}{The name of the Java method or field being accessed.}
  \item{value}{The value to be assigned to the field.}
  \item{...}{Additional arguments; ignored for \code{print}.}
}
\details{
  The \code{$} method is equivalent to \code{.Java(obj, name,)}

  The \code{[[} method is equivalent to
  \code{.Java(NULL, "getField", name, x)}.

  The \code{[[<-} method is equivalent to
  \code{.Java(NULL, "setField", name, x, value)}.
}
\value{

  The return value of \code{$} is a function which remembers the
  arguments to this function call and, when called, results in a call to
  \code{\link{.Java}} using those arguments.

  The return value of \code{[[} is the field value.

  \code{print} is called for its side effect, i.e., providing a compact
  represntation of the object.

}
\references{\url{http://www.omegahat.org/RSJava}}
\author{Duncan Temple Lang}
\seealso{
\code{\link{.Java}}
}

\examples{
 p <- .Java("System", "getProperties", .convert=FALSE)
 p$getProperty("java.class.path")
}
\keyword{programming}
\keyword{interface}