Click here to watch in Youtube :
https://www.youtube.com/watch?v=6Axr69iVw8g&list=UUhwKlOVR041tngjerWxVccw
Click the below Image to Enlarge
Java Tutorial: Annotations in java | Java annotations [Built-In Annotations in Java - @retention] |
Java Tutorial: Annotations in java | Java annotations [Built-In Annotations in Java - @retention] |
import java.lang.annotation.ElementType; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; import java.lang.annotation.Target; import java.lang.reflect.Method; @Retention(RetentionPolicy.RUNTIME) @Target(ElementType.METHOD) @interface MyMultiValueAnnotation { int getValue() default 2; String getMessage() default "hello"; double getDoubleValue() default 5.5; } class Message { @MyMultiValueAnnotation public void displayHi() { System.out.println("Hi"); } } public class MultiValueAnnotationDemo { public static void main(String[] args) throws NoSuchMethodException, SecurityException { Message message = new Message(); Method method = message.getClass().getMethod("displayHi"); MyMultiValueAnnotation mmva = method .getAnnotation(MyMultiValueAnnotation.class); System.out.println("value is: " + mmva.getValue()); System.out.println("message is: " + mmva.getMessage()); System.out.println("DoubleValue is: " + mmva.getDoubleValue()); } }Output
value is: 2 message is: hello DoubleValue is: 5.5Click the below link to download the code:
https://sites.google.com/site/ramj2eev1/home/javabasics/AnnotationDemo_Retention_App.zip?attredirects=0&d=1
Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/AnnotationDemo_Retention_App
Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/47d09ebb24294f7b507419345f38ec4cde27d544/BasicJava/AnnotationDemo_Retention_App/?at=master
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