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Is there a way to add a method to a standard Java class, such as Object?
I know you can’t subclass classes like String which are final, but Object isn’t. I know I could just subclass Object and define a method in the subclass and make all my classes subclasses of that, but I’d rather not have to do that.
I suspect that this is either impossible or I’ve overlooked something. Thanks in advance for any answers.
You can’t do this in Java. But other JVM languages are capable of doing so:
in groovy
ExpandoMetaClassallows adding arbitrary methods to any classin scala implicit conversions can be used to emulate such behaviour in statically-typed manner, see: Inject methods into existing classes
also you can run ruby (jruby) and javascript on top of JVM