rJava (version 0.4-11)

jcast: Cast a Java object to another class

Description

.jcast returns a Java object reference cast to another Java class.

Usage

.jcast(obj, new.class)

Arguments

obj

a Java object reference

new.class

fully qualified class name in JNI notation (e.g. "java/lang/String"). Although rJava itself performs no type check in .jcast, Java will produce an exception on the first use if the cast is illegal.

Value

• Returns a Java object reference (jobjRef) to the object obj, changing the object class.

Details

This function is necessary if a argument of .jcall or .jnew is defined as the superclass of the object to be passed. (See .jcall) No type check is performed and the original object is not modified.

See Also

.jcall

Examples

v <- .jnew("java/util/Vector")
.jcall("java/lang/System","I","identityHashCode",.jcast(v, "java/lang/Object"))