1回答

allenfeng

2021-06-04

参考 JDK Compilation Overview ：

The process of compiling a set of source files into a corresponding set of class files is not a simple one, but can be generally divided into three stages. Different parts of source files may proceed through the process at different rates, on an "as needed" basis.

This process is handled by the JavaCompiler class.

1. All the source files specified on the command line are read, parsed into syntax trees, and then all externally visible definitions are entered into the compiler's symbol tables.

2. All appropriate annotation processors are called. If any annotation processors generate any new source or class files, the compilation is restarted, until no new files are created.

3. Finally, the syntax trees created by the parser are analyzed and translated into class files. During the course of the analysis, references to additional classes may be found. The compiler will check the source and class path for these classes; if they are found on the source path, those files will be compiled as well, although they will not be subject to annotation processing.

编译过程分为三个步骤：

1. 解析源文件生成抽象语法树

2. 调用已注册的注解处理器（注解处理器中可以自行生成新的Java文件）

3. 所有源文件生成字节码

如果第2步中，注解处理器生成了新的源代码，那么JAVA编译器将重复第1-2步，直到不再生成新的源代码。

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