Click here to watch in Youtube :
https://www.youtube.com/watch?v=_9EQcNFq47E&list=UUhwKlOVR041tngjerWxVccw
Display.java
https://sites.google.com/site/ramj2eev1/home/javabasics/ReflectionDemo_access_method_annotation.zip?attredirects=0&d=1
Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/ReflectionDemo_access_method_annotation
Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/7b0b4fbacd011a10dc23b42c4acc3ae6988db782/BasicJava/ReflectionDemo_access_method_annotation/?at=master
See also:
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https://www.youtube.com/watch?v=_9EQcNFq47E&list=UUhwKlOVR041tngjerWxVccw
Display.java
import java.lang.annotation.ElementType; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; import java.lang.annotation.Target; @Retention(RetentionPolicy.RUNTIME) @Target(ElementType.METHOD) @interface MyAnnotation { public String name(); public String value(); } public class Display { @MyAnnotation(name = "Country", value = "India") public void doSomething() { } }ReflectionDemo1.java
import java.lang.annotation.Annotation; import java.lang.reflect.Method; /** * We can access the annotations of a class,method or field at runtime. * * Method Annotations Example: */ public class ReflectionDemo1 { public static void main(String[] args) { try { Class<Display> classObj = Display.class; Method method = classObj.getMethod("doSomething", null); /* * Returns:annotations present on this element * */ Annotation[] annotationArray = method.getAnnotations(); for (Annotation annotation : annotationArray) { if(annotation instanceof MyAnnotation) { MyAnnotation myAnnotation = (MyAnnotation)annotation; System.out.println("name: "+myAnnotation.name()); System.out.println("value: "+myAnnotation.value()); } } } catch (NoSuchMethodException | SecurityException e) { e.printStackTrace(); } } }Output
name: Country value: IndiaReflectionDemo2.java
import java.lang.reflect.Method; /** * We can access the annotations of a class,method or field at * runtime. * * Method Annotations Example: */ public class ReflectionDemo2 { public static void main(String[] args) { try { Class<Display> classObj = Display.class; Method method = classObj.getMethod("doSomething", null); /* * Returns: this element's annotation for the specified * annotation type if present on this element, else null * */ MyAnnotation myAnnotation = method.getAnnotation(MyAnnotation.class); System.out.println("name: " + myAnnotation.name()); System.out.println("value: " + myAnnotation.value()); } catch (NoSuchMethodException | SecurityException e) { e.printStackTrace(); } } }Output
name: Country value: IndiaClick the below link to download the code:
https://sites.google.com/site/ramj2eev1/home/javabasics/ReflectionDemo_access_method_annotation.zip?attredirects=0&d=1
Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/ReflectionDemo_access_method_annotation
Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/7b0b4fbacd011a10dc23b42c4acc3ae6988db782/BasicJava/ReflectionDemo_access_method_annotation/?at=master
See also:
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