javaIs: Performs class comparisons for Java objects
In SJava: The Omegahat interface for R and Java

Description Usage Arguments Details Value Author(s) References See Also Examples

Allows one to test if a Java object (in Omegahat) is an object of a particular class, or implements a particular Java interface.

1	javaIs(obj, klass, instanceof=TRUE)

`obj`	the Java object whose class is being queried and compared
`klass`	the name of a Java class or the Class reference object with which the object `obj` is being compared.
`instanceof`	a logical value indicating whether the comparison should be done using the equality of classes or the Java `instanceof` semantics. The former tests whether the class of `obj` is the same as the class identified by `klass`. The latter identifies whether obj implements the Java interface class `klass`. (There is also the assignable from semantics which may or may not be currently present).

This calls the Omegahat evaluator's is method.

A logical value indicating whether the class of obj is related to klass in the specified comparison. This is TRUE or FALSE.

Duncan Temple Lang, John Chambers

http://www.omegahat.org/RSJava

.JNew .Java

  x <- .JNew("java.util.Vector")

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

   # FALSE
  javaIs(x, "java.util.Hashtable")