Java中的注解处理是什么？
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What is annotation processing in Java?
提问by Xolve
Quoting, Sun's Official Java Tutorial
Class names, 'HelloWorldApp', are only accepted if annotation processing is explicitly requested
类名称“HelloWorldApp”仅在明确请求注释处理时才被接受
What does it mean? And how to apply it?
这是什么意思？以及如何应用它？
采纳答案by Arne Deutsch
"Annotation Processing" is a hook into the compile process of the java compiler, to analyse the source code for user defined annotations and handle then (by producing compiler errors, compiler warning, emitting source code, byte code ...).
“注解处理”是java编译器编译过程的一个钩子，分析用户定义注解的源代码并处理（通过产生编译器错误，编译器警告，发出源代码，字节码......）。
API reference: http://java.sun.com/javase/6/docs/api/javax/annotation/processing/package-summary.html
API参考：http: //java.sun.com/javase/6/docs/api/javax/annotation/processing/package-summary.html
回答by Paul Wagland
From the very next line of the pagethat you refer to:
从您引用的页面的下一行开始：
Class names, 'HelloWorldApp', are only accepted if annotation processing is explicitly requested
If you receive this error, you forgot to include the .java suffix when compiling the program. Remember, the command is javac HelloWorldApp.java not javac HelloWorldApp.
类名称“HelloWorldApp”仅在明确请求注释处理时才被接受
如果您收到此错误，则您在编译程序时忘记包含 .java 后缀。请记住，命令是 javac HelloWorldApp.java 而不是 javac HelloWorldApp。
That is, the string that you are referring to is a possible error that you might get when trying to compile the examples. The very nextline in the document, tells you how to resolve the issue.
也就是说，您所指的字符串可能是您在尝试编译示例时可能遇到的错误。在第二天的文件中线上，告诉你如何解决这个问题。
If you want to know more about annotations, what they are, and how to use them, then I would suggest to go through the Annotations tutorial.
如果您想了解更多关于注解、它们是什么以及如何使用它们，那么我建议您阅读注解教程。
回答by jaibardhan
This error is due to incorrect use of java compilation command i.e javac with file name w/o java extension (.java)
这个错误是由于错误地使用了 java 编译命令，即文件名没有 java 扩展名 (.java) 的 javac
Use proper compilation command
使用正确的编译命令
javac HelloWorldApp.java
javac HelloWorldApp.java
Command used foe execution
命令使用敌人执行
java HelloWorldApp
java HelloWorldApp
