The predicate for whether a Java object is an instance of a given Java class.
jobject-of-class-p object class-spec => result
A Java object.
A class specifier that find-java-class accepts or a Java class.
A generalized boolean.
jobject-of-class-p takes a Java object and a Java class specification, and returns true if the object is an instance of this class or any of its subclasses.
class-spec must be either a class specifier that find-java-class accepts, or a Java class, that is a
Jobject of class
java.lang.Class. The Java class may be an interface, in which case the result verifies whether the object implements the interface.
LispWorks User Guide and Reference Manual - 20 Sep 2017