rJava (version 0.8-1)

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 = "java/lang/Object", check = FALSE, convert.array = FALSE)

Arguments

obj
a Java object reference
new.class
fully qualified class name in JNI notation (e.g. "java/lang/String").
check
logical. If TRUE, it is checked that the object effectively is an instance of the new class. See %instanceof%. Using FALSE (the default) for this argument, rJava does not perform type che
convert.array
logical. If TRUE and the object is an array, it is converted into a jarrayRef reference.

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). The original object is not modified. The default values for the arguments check and convert.array is FALSE in order to guarantee backwards compatibility, but it is recommended to set the arguments to TRUE

See Also

.jcall

Examples

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

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