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What is single member annotation and how to process it?


Description:

  • Single member contatins only one member, and it is also kind of normal annotation.
  • The only difference we can make is the value assignment.
  • We can assign the value without specifing the member name as shown in the below example. This only works when we declare name of the member as value.


Code:
package com.java2novice.annotations;

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

@Retention(RetentionPolicy.RUNTIME)
@interface MyAnnotn{
	
	String value();
}

public class MySingleMembAnnotation {

	@MyAnnotn("java2novice.com")
	public void myAnnotationTestMethod(){
		
		try {
			Class<? extends MySingleMembAnnotation> cls = this.getClass();
			Method mth = cls.getMethod("myAnnotationTestMethod");
			MyAnnotn myAnno = mth.getAnnotation(MyAnnotn.class);
			System.out.println("value: "+myAnno.value());
		} catch (SecurityException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (NoSuchMethodException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	public static void main(String a[]){
		
		MySingleMembAnnotation mat = new MySingleMembAnnotation();
		mat.myAnnotationTestMethod();
	}
}

Output:
value: java2novice.com
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Knowledge Centre
Inner class and Anonymous class
Inner class: classes defined in other classes, including those defined in methods are called inner classes. An inner class can have any accessibility including private.

Anonymous class: Anonymous class is a class defined inside a method without a name and is instantiated and declared in the same place and cannot have explicit constructors.
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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
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