There is almost always a single SecurityManager instance per application.

一个应用几乎总是只有一个SecurityManager实例。

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Running the code in Listing 6 under a SecurityManager gives the following output.

在SecurityManager下运行清单6中的代码会得到以下输出。

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The responsibility of enforcing a system security policy lies with a class called SecurityManager.

由一个名为 SecurityManager 的类负责实施系统安全策略。

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