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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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Knowledge Centre
Can we call servlet destory() from service()?
As you know, destory() is part of servlet life cycle methods, it is used to kill the servlet instance. Servlet Engine is used to call destory(). In case, if you call destory method from service(), it just execute the code written in the destory(), but it wont kill the servlet instance. destroy() will be called before killing the servlet instance by servlet engine.
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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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