问题
Lets say a Java program defines the class A, which has a nested static class 'B'.
How is it possible to access class B using the Ruby-Java Bridge?
For example, these attempts do not work:
A = Rjb::import('package.A')
A.B
A::B
Is there a way to accomplish this?
回答1:
Google cached this result from 2006. Sounds reasonable though, so take it and experiment!
(PS: I'm a java + ruby user, but never used Rjb, so just passing along the info...)
http://webcache.googleusercontent.com/search?q=cache:1p7OdptgsYUJ:blog.voneicken.com/2006/12/3/accessing-inner-java-classes-via-rjb+inner+class+rjb+ruby+java&cd=10&hl=en&ct=clnk&gl=au
I couldn’t resist investigating the issue Les had with accessing static inners and I think I found the syntax. Accessing inner classes (static or not) can look a little wonky but it is doable. Statics are loaded like any other class, but their pathname is ‘OuterClass$StaticInnerClass’. The nonstatic inner classes are a tiny bit trickier. Import like the static, with ‘OuterClass$Inner’; now you have the inner class, but the trick is in instantiating an instance: you must provide an OuterClass instance as the first argument to the constructor (thus revealing a little behind the curtain of java the implicit access an inner has to its outer’s methods and data):
Outer = Rjb::import(‘Outer’)
Inner = Rjb::import(‘Outer$Inner’)
StaticInner = Rjb::import(‘Outer$StaticInner’)
outer = Outer.new
inner = Inner.new(outer)
staticInner = StaticInner.new
来源：https://stackoverflow.com/questions/8813083/how-to-access-nested-static-classes-using-rjb