使用安全管理器阻止公共方法访问
我曾经看到一篇文章说我们可以使用SecurityManager来限制某些类调用另一个类的public方法。我们该怎么做呢？
I had once come across a post that said that we can use the SecurityManager to restrict certain classes from calling a public method of another class. How do we do that?
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你至少可以链接到答案，然后更清楚地说出你不明白的地方。 所以，我将链接你看看我昨天对类似问题的回答。
如果还有不清楚的地方，请对此答案发表评论。
You could have at least linked to the answer, and then said more clearly, what you don't understand. So, I will link for you to my answer to a similar question from yesterday.
If something still is not clear, comment on this answer.
也许他们正在考虑对通过 package.access 安全属性加载的其他类加载的类隐藏包层次结构。请参阅安全编码指南的指南 1-1a Java 编程语言，版本 3.0。除此之外，如果一个类看不到 ClassLoader（无论如何！），那么它们将无法与该类加载器的类进行交互。
Perhaps they are thinking of hiding packages hierarchies from classes loaded by other class loaded through the
package.accesssecurity property. See Guidelines 1-1a of the Secure Coding Guidelines for the Java Programming Language, Version 3.0. Other than that, if a class cannot see aClassLoader(by any means!) then they will not be able to interact with classes of that class loader.