Native code is compiled (and can be recompiled) by a Just-in-time (JIT) compiler while the application runs, based on which classes and methods are invoked frequently.

本机代码在应用程序运行时由即时(JIT)编译器编译(而且可以重新编译)，基于经常调用的类和方法。

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To eliminate interpretation's high performance cost, a JIT compiler selects frequently executed code to be translated directly to the CPU's native instructions.

为了消除解释的高性能代价，JIT编译器选择将频繁执行的代码直接转换为CPU的本地指令。

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The AOT-compiled code is the equivalent to the native code the JIT compiler would generate if it used a fixed optimisation level.

如果JIT使用了一种固定的优化级别，那么AOT编译的代码就等同于JIT编译器生成的本地代码。

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Performance-wise, the winner is a pre-release version of Tower Technology's TowerJ compiler, which generates a native executable from pure Java code that runs almost 25 percent faster than the fastest Java interpreter, even when the interpreter has a just-in-time compiler.

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