![]() ![]() ![]() It needs to be noted that apt can only generate new Java classes, and cannot modify existing Java classes. This means you can use apt to dynamically generate code logic. A specific processing tool receives Java source code or a compiled byte code as input, and then outputs some files (.java files in general). We will introduce methods of processing CLASS-level annotations below.Īnnotation Processing Tool is a tool built in javac for scanning and processing annotation information at compilation. When declared as SOURCE, annotations are retained only at source code level and dropped at compile whendeclared as CLASS, annotations are recorded in the class file by the compiler, but they are ignored during runtime, the default Retention level is Class whendeclared as RUNTIME, annotations will be retained until runtime and be obtained by reflection during runtime. Java annotation can be embedded into byte code when the compiler generates a class file, and the label is obtained when executed by Java virtual machine.Īccording to different values the meta annotation specified,annotations can be divided into three types: SOURCE, CLASS and RUNTIME. ![]() Unlike Javadoc, Java annotation has reflexivity. Java annotation is a special syntactic metadata supported to be added into source code starting from Java 5.0.Ĭlasses, methods, variables, parameters and packages in Java can be labeled. ![]()
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