\name{javaIs}
\alias{javaIs}
\title{Performs class comparisons for Java objects}
\description{
 Allows one to test if a Java object (in Omegahat) is 
an object of a particular class, or implements
a particular Java interface.
}
\usage{
javaIs(obj, klass, instanceof=TRUE)
}
\arguments{

  \item{obj}{the Java object whose class is being queried and compared}

  \item{klass}{the name of a Java class or the Class reference object
	with which the object \code{obj} is being compared.}

  \item{instanceof}{a logical value indicating whether the comparison
	should be done using the equality of classes or the Java
	\code{instanceof} semantics.  The former tests whether the class of
	\code{obj} is the same as the class identified by \code{klass}.  The
	latter identifies whether obj implements the Java interface class
	\code{klass}.  (There is also the \emph{assignable from} semantics
	which may or may not be currently present).}

}
\details{
  This calls the Omegahat evaluator's \code{is} method.
}
\value{
  A logical value indicating whether the class of \code{obj} is related
  to \code{klass} in the specified comparison.  This is \code{TRUE} or
  \code{FALSE}.
}
\references{\url{http://www.omegahat.org/RSJava}}
\author{Duncan Temple Lang, John Chambers }

\seealso{ 
\code{\link{.JNew}}
\code{\link{.Java}}
}

\examples{
  x <- .JNew("java.util.Vector")

    # TRUE
  javaIs(x, "java.util.Vector")
  javaIs(x, "java.util.List", TRUE)

   # FALSE
  javaIs(x, "java.util.Hashtable")
}
\keyword{programming}
\keyword{interface}