* The syntactic locations where annotations may appear are split into * declaration contexts , where annotations apply to declarations, and * type contexts , where annotations apply to types used in * declarations and expressions. * * The constants {@link #ANNOTATION_TYPE} , {@link #CONSTRUCTOR...
RetentionPolicy.SOURCE:这种类型的Annotations只在源代码级别保留,编译时就会被忽略,在class字节码文件中不包含; RetentionPolicy.CLASS:这种类型的Annotations编译时被保留,默认的保留策略,在class文件中存在,但JVM将会忽略,运行时无法获得; RetentionPolicy.RUNTIME:这种类型的Annotations将被JVM保留,所以他们能在运行时被JVM...
Thrown to indicate that a program has attempted to access an element of an annotation whose type has changed after the annotation was compiled (or serialized). This exception can be thrown by the java.lang.reflect.AnnotatedElement API used to read annotations reflectively....
Annotation Types Summary Annotation TypeDescription Documented Indicates that annotations with a type are to be documented by javadoc and similar tools by default. Inherited Indicates that an annotation type is automatically inherited. Native Indicates that a field defining a constant value may be referen...
* and similar tools by default. This type should be used to annotate the * declarations of types whose annotations affect the use of annotated * elements by their clients. If a type declaration is annotated with * Documented, its annotations become part of the public API ...
Annotations Basics Declaring an Annotation Type Predefined Annotation Types Type Annotations and Pluggable Type Systems Repeating Annotations Questions and Exercises « Previous•Trail•Next » The Java Tutorials have been written for JDK 8. Examples and practices described in this page don't take...
In my previous article in this series, I introduced Java's new metadata facility and described the built-in annotation types @Override,@Deprecated, and @SuppressWarnings. In this article I'll show you how to write your own annotation types and make use of the built-in annotations from the ...
documented by javadoc and similar tools. This type should be used to annotate the declarations of types whose annotations affect the use of annotated elements by their clients. If a type declaration is annotated with Documented, its annotations become part of the public API of the annotated ...
fields, methods, and so on. The annotation appears first and often (by convention) on its own line, and may include optional arguments: JDK5引入了Metedata(元数据)很容易的就能够调用Annotations.Annotations提供一些本来不属于程序的数据，比如:一段代码的作者或者告诉编译器禁止一些特殊的错误。
Annotations have a number of uses, among them: Information for the compiler Compile-time and deployment-time processing Runtime processing Format and Effect @annotationName{field = val} Declarations: declarations of classes, fields, methods, and other elements. When used on ...