JAVA EXAMPLE PROGRAMS

JAVA EXAMPLE PROGRAMS

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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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List Of All Annotation (Metadata) Programs:

  1. How to create basic custom annotation?
  2. What is Retention policy in java annotations?
  3. How to get annotations at runtime using java reflection?
  4. How to get all annotations from a class?
  5. How to assign default values to custom annotations?
  6. What is marker annotation and how to process it at runtime?
  7. Built-in Java Annotations: @Deprecated example
  8. Built-in Java Annotations: @Override example
  9. Built-in Java Annotations: @SuppressWarnings example
  10. What is single member annotation and how to process it?
Knowledge Centre
String Vs StringBuffer
We know that String is immutable object. We can not change the value of a String object once it is initiated. If we try to change the value of the existing String object then it creates new object rather than changing the value of the existing object. So incase, we are going to do more modificatios on String, then use StringBuffer. StringBuffer updates the existing objects value, rather creating new object.
Famous Quotations
The greatest obstacle to discovery is not ignorance; it is the illusion of knowledge.
-- Daniel J. Boorstin

About Author

I'm Nataraja Gootooru, programmer by profession and passionate about technologies. All examples given here are as simple as possible to help beginners. The source code is compiled and tested in my dev environment.

If you come across any mistakes or bugs, please email me to [email protected].

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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java™ Platform Standard Ed. 8 - API Specification | Java is registered trademark of Oracle.
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