类加载器有一个十分严格的安全管理器来限制恶意调用。
The class loader has a fairly tight security manager in place that restricts malicious calls.
版本5.3还引入了限制类的概念。
无特殊接口或者类路径限制。
我怎样才能限制类的使用？
它是可能的限制在一个类是特定类型的扩展方法？
Is it possible to limit extension methods in a class to be of specific type?
而总有些类显然不可能是不变类的，这时也要尽可能的限制它的可变性。
There are some class immutable is impossible, then try to limit the mutability of them.
第一类是它的外形约束限制了它的使用。
The first set is its physical constraints that limit its use.
第一类是它的外形约束限制了它的使用。
The first set is its physical constraints that limit its use.
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