How do I import a java classname with a dollar sign ($), or refer to a field or method with one, in Jython?

问题

Naive attempts fail: e.g.

from mypackage import SomeClass$

gives

javax.script.ScriptException: SyntaxError: no viable alternative at character '$' in at line number 1

This question is unrelated to java nested classes, which are easily importable in Jython.

Such a class is for example the scala.Predef$ class, which one can then access with Predef$.foobar.

How can I achieve this import?

回答1:

I found a solution using Java Reflection like this:

from java.lang import Class

person = Class.forName("full.path.to.Person$").getField("MODULE$").get(None)

It's not pretty but it works. It might be nicer to use the Scala reflection API if that's available.

来源：https://stackoverflow.com/questions/44623470/how-do-i-import-a-java-classname-with-a-dollar-sign-or-refer-to-a-field-or