Click here to watch in Youtube :
https://www.youtube.com/watch?v=JRqdI7LNqTA&list=UUhwKlOVR041tngjerWxVccw
Click the below Image to Enlarge
Java Tutorial: Annotations in java | Java annotations [Type of annotation] |
Java Tutorial: Annotations in java | Java annotations [Type of annotation] |
Java Tutorial: Annotations in java | Java annotations [Type of annotation] |
Java Tutorial: Annotations in java | Java annotations [Type of annotation] |
@interface MyMarkerAnnotation { } public class MarkerAnnotationDemo { @MyMarkerAnnotation public void display() { System.out.println("Hi"); } public static void main(String args[]) { MarkerAnnotationDemo markerAnnotationDemo = new MarkerAnnotationDemo(); markerAnnotationDemo.display(); } }Output
HiSingleValueAnnotationDemo.java
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 MySingleValueAnnotation { int getValue(); } class Display { @MySingleValueAnnotation(getValue = 20) public void displayHi() { System.out.println("Hi"); } } public class SingleValueAnnotationDemo { public static void main(String[] args) throws NoSuchMethodException, SecurityException { Display display = new Display(); Method method = display.getClass().getMethod("displayHi"); MySingleValueAnnotation msva = method .getAnnotation(MySingleValueAnnotation.class); System.out.println("value is: " + msva.getValue()); } }Output
value is: 20MultiValueAnnotationDemo.java
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(); String getMessage(); } class Message { @MyMultiValueAnnotation(getValue = 500, getMessage = "Welcome") 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()); } }Output
value is: 500 message is: WelcomeClick the below link to download the code:
https://sites.google.com/site/ramj2eev1/home/javabasics/AnnotationDemo_Types_App.zip?attredirects=0&d=1
Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/AnnotationDemo_Types_App
Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/47d09ebb24294f7b507419345f38ec4cde27d544/BasicJava/AnnotationDemo_Types_App/?at=master
See also:
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