Obtains the value of a field
.jfield returns the value of the specified field on an object.
.jfield(o, sig = NULL, name, true.class = is.null(sig), convert = TRUE) `.jfield<-`(o, name, value)
- Class name or object (Java reference) whose field is to be accessed. Static fields are supported both by specifying the class name or using an instance.
- signature (JNI type) of the field. If set to
NULLrJava attempts to determine the signature using reflection. For efficiency it is recommended to specify the signature, because the reflection lookup is quite expensive.
- name of the field to access
- by default the class of the resulting object matches
the siganture of the field. Setting this flag to
.jfieldto use true class name of the resulting object instead. (this flag has no effect on scalar fiel
- when set to
TRUEall references are converted to native types (where possible). Otherwise Java references are returned directly.
- value to assign into the field. The field signature is
determined from the value in the same way that parameter signatures
are determined in
.jcall- be sure to cast the value as necessary, no au
The detection of a field signature in
.jfield using reflection
is considerably expensive (more than 3 additional method calls have to
be performed), therefore it is recommended for time-critical code to
specify the field signature beforehand.
NOTE: The sequence of arguments in
.jfield has been changed
since rJava 0.5 to be more consistent and match the sequence in
.jsimplify is no longer needed as primitive
types are obtained directly.
.jfield: contents of the field,
.jfield<-: modified object.