Because exceptions are rarely quick to process, the additional overhead of loading extra classes may push operation latency above a critical threshold.
由于异常通常难以快速处理，所以加载额外的类的附加开销可能使操作延迟超出重要阈值。
Classes are often loaded through a combination of explicit and implicit class loading.
类的装入通常组合了显式和隐式类装入。
Then, when it is time to start the JVM, instead of loading the system classes from scratch, the memory-mapped files are loaded.
这样，在启动J VM时，就不会从头开始装入系统类，而是装入内存映射文件。
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