为了深入了解编译器做了什么，请用 -XX:+PrintCompilation 标志调用 JVM，这个标志会使编译器（客户机或服务器）每次运行的时候打印一条短消息。

To get some insight into what the compiler is doing, try invoking the JVM with the -XX:+PrintCompilation flag, which causes the compiler (client or server) to print a short message every time it runs.

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