如何使用Rjb访问嵌套的静态类？ [英] How to access nested static classes using Rjb?

问题描述

让我们说Java程序定义了A类，它有一个嵌套的静态类'B'。

Lets say a Java program defines the class A, which has a nested static class 'B'.

如何使用Ruby-访问B类是怎样的？ Java Bridge？

How is it possible to access class B using the Ruby-Java Bridge?

例如，这些尝试不起作用：

For example, these attempts do not work:

A = Rjb::import('package.A')
A.B 
A::B

有没有办法实现这个目标？

Is there a way to accomplish this?

推荐答案

Google从2006年开始缓存此结果。但听起来很合理，所以接受它并进行实验！

Google cached this result from 2006. Sounds reasonable though, so take it and experiment!

（PS：我是java + ruby​​用户，但从未使用过Rjb，所以只是传递信息......）

(PS: I'm a java + ruby user, but never used Rjb, so just passing along the info...)

http://webcache.googleusercontent.com/search?q=缓存：1p7OdptgsYUJ：blog.voneicken.com/2006/12/3/accessing-inner-java-classes-via-rjb+inner+class+rjb+ruby+java& CD = 10安培; HL = EN&安培; CT = clnk&安培; gl = au

我无法抗拒调查Les访问静态内容的问题，我想我找到了语法。访问内部类（静态或非静态）看起来有点不可思议，但它是可行的。静态加载像任何其他类一样，但它们的路径名是'OuterClass $ StaticInnerClass'。非静态内部类别有点棘手。像静态一样导入'OuterClass $ Inner';现在你有了内部类，但诀窍在于实例化一个实例：你必须提供一个OuterClass实例作为构造函数的第一个参数（因此在java的幕后揭示内部对其外部方法的隐式访问）数据）：

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

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