只有在第一次真正需要用到代码时才会下载代码。
The downloading of code is deferred until it is actually needed for the first time.
然而，当分析这段代码时，您会意识到只有在第一次调用方法时才需要同步。
However, when you analyze it you realize that synchronization is required only for the first invocation of the method.
提交的页只有在第一次被引用时才装入主存，因此成为请求式分页。
Committed pages are loaded into main memory only when the process first references them. Hence the name on-demand paging.
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