}//获取方法上的System.out.println(" ===方法上的=== ");Methodinfo=testClass.getMethod("info");DemoAnnotationannotation=info.getAnnotation(DemoAnnotation.class); System.out.println("annotation = "+ annotation);DemoAnnotationdeclaredAnnotation=info.getDeclaredAnnotation(DemoAnnotation.class); System.out...
* @return an array of the kinds of elements an annotation type * can be applied to */ ElementType[] value(); } 而下面是ElementType枚举中定义的属性,不设置Target的时候,除了TYPE_PARAMETER,TYPE_USE,其他地方都相当于配置上了。 代码语言:txt AI代码解释 public enum ElementType { /** 通过ElementTyp...
@Retention定义了该Annotation被保留的时间长短:某些Annotation仅出现在源代码中,而被编译器丢弃;而另一些却被编译在class文件中;编译在class文件中的Annotation可能会被虚拟机忽略,而另一些在class被装载时将被读取(请注意并不影响class的执行,因为Annotation与class在使用上是被分离的)。使用这个meta-Annotation可以对 An...
Annotation 类型定义了 Annotation 的名字、类型、成员默认值。一个 Annotation 类型可以说是一个特殊的 Java 接口,它的成员变量是受限制的,而声明 Annotation 类型时需要使用新语法。当我们通过 Java反射API 访问 Annotation 时,返回值将是一个实现了该 Annotation 类型接口的对象,通过访问这个对象能方便的访问到其 An...
4. Type Annotations The Type Annotations in Java are applied to places where a type is being used and is usually declared annotated using@Targetannotation. Example: @Target(ElementType.TYPE_USE) 5. Repeating Annotations In Java, the "@RepeatedTest" annotation is used to specify that a test met...
Namespace: Java.Lang.Annotation Assembly: Mono.Android.dll C# Ikkopja [Android.Runtime.Register("TYPE_USE", ApiSince=26)] public static Java.Lang.Annotation.ElementType? TypeUse { get; } Property Value ElementType Attributes RegisterAttribute Remarks Portions of this page are modifications ...
ANNOTATION_TYPE,//注释类型声明 PACKAGE,//包声明 //ElementType.TYPE_USER和ElementType.TYPE_PARAMETER是Java 8新增的两个注解, //用于描述注解的使用场景 TYPE_PARAMETER,//作为参数使用 TYPE_USE//作为类型使用 } 1. 2. 3. 4. 5. 6. 7.
TYPE}) public @interface Tag { String name() default "undefined"; String description(); } Java 使用 Annotation 接口来代表程序元素前面的注解,该接口是所有 Annotation 类型的父接口。自定义的注解继承了 Annotation 这个接口,因此自定义注解中包含了 Annotation 接口中所有的方法: 代码语言:javascript 代码...
A target annotation specifies one of the following element types as its value: ElementType.ANNOTATION_TYPE can be applied to an annotation type. ElementType.CONSTRUCTOR can be applied to a constructor. ElementType.FIELD can be applied to a field or property. ElementType.LOCAL_VARIABLE can be ...
This means that annotations can be used anywhere you use a type. A few examples of where types are used are class instance creation expressions (new), casts, implements clauses, and throws clauses. This form of annotation is called a type annotation and several examples are provided in ...