The user defined name of the device (Read Only).

用户定义的设备的名称（只读）。

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The context is a user-defined name that creates a partition in the cache into which all of the classes loaded by that JVM are stored.

上下文是一个用户定义的名称，它在缓存中创建一个分区，这个JVM装载的所有类都存储在这个分区中。

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During which it adds user defined properties, and finds the main class name.

在这个过程中，它可以添加用户定义的属性，找到主类名。

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