The document discusses the Annotation Processing Tool (APT). APT allows annotations to be processed at compile time to generate Java code. It describes how APT uses annotations to map entities to models using reflection. It also discusses the evolution of APT from Java 5 to Java 6 specifications and how it can be used with JSON annotations to generate POJO classes from JSON.
Consider the following code: A.java: import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; @Retention(RetentionPolicy.RUNTIME) @interface A{} C.java: import java.util.*; @A public class C { public static void main(String[] args){ System.out.println(Arrays.toString(C.class.getAnnotations())); } } Compiling and running works as expected: $ javac *.java $ java -cp . C [@
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