Java Method getAnnotation() Method

The getAnnotation() method of Method class returns this element's annotation if such an annotation is present for the specified type, otherwise returns null.

Syntax

Parameter

annotationClass - the Class object corresponding to the annotation type

Returns

This element's annotation if present on this element, otherwise null.

Throws

NullPointerException

Example 1

  //import statement
import java.lang.*;   //import lang package
import java.lang.annotation.Retention; //import Retention
import java.lang.annotation.RetentionPolicy; //import Retention Policy
import java.lang.reflect.Method; //import  Method class


 @Retention(RetentionPolicy.RUNTIME)
 @interface DemoClassX1 {
   String str();
   int val();
}

public class ReflectMethodgetAnnotationExample1 {

   @DemoClassX1(str = "Demo_Annotation", val = 100)
  
   public static void example() {
      ReflectMethodgetAnnotationExample1 obj = new ReflectMethodgetAnnotationExample1();

      try {
         Class c = obj.getClass(); //get the class of object 

         Method m = c.getMethod("example");

         DemoClassX1 annotation = m.getAnnotation(DemoClassX1.class);

         System.out.println(annotation.str() + " " + annotation.val());  //print statemet
      } catch (NoSuchMethodException exc) {
         exc.printStackTrace();
      }
   }
   public static void main(String args[]) {
      example();
   }
}

Test it Now

Output:

Demo_Annotation 100

Example 2

 import java.lang.annotation.*;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.reflect.Method;

public class ReflectMethodgetAnnotationExample2 {
   public static void main(String[] args) {
	  Method[] mthd = SampleDemo.class.getMethods();
      Annotation annotation = mthd[0].getAnnotation(CustomAnnotationX21.class);
      if(annotation instanceof CustomAnnotationX21){
         CustomAnnotationX21 custom = (CustomAnnotationX21)annotation;
         System.out.println("name_: " + custom.name());
         System.out.println("value_: " + custom.value());
      }
   }
}

@CustomAnnotationX21(name = "SampleDemo",  value = "SampleDemo  Annotation")
class SampleDemo {
   private String splField;
   
   @CustomAnnotationX21(name="getSplField",  value = "Sample Method Annotation")
   public String getSplField() {
      return splField;
   }

   public void setSampleField(String sampleField) {
      this.splField = sampleField;
   } 
}

@Retention(RetentionPolicy.RUNTIME)
@interface CustomAnnotationX21 {
   public String name();
   public String value();
}

Test it Now

Output:

name_: getSplField
value_: Sample Method Annotation

Next TopicJava Method Class

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