BeanPostProcessor not get called its implemented bean , but invoke for all other beans

my bean.xml

hi friends.., i am just learning spring . i implement the interface BeanPostProcessor in HelloWorld.java . its methods invoked for all other beans , but not itself(Helloworld.java bean)

 <bean id="helloWorld" class="com.tutorialspoint.HelloWorld" >     </bean>  
   <!-- Definition for textEditor bean -->
   <bean id="textEditor" class="com.tutorialspoint.TextEditor">
      <property name="spellChecker" ref="spellChecker"/>
   </bean>

   <!-- Definition for spellChecker bean -->
   <bean id="spellChecker" class="com.tutorialspoint.SpellChecker">
   </bean>

Helloworld.java

public class HelloWorld implements BeanPostProcessor {

    @Override
    public Object postProcessAfterInitialization(Object bean, String name)
            throws BeansException {

        System.out.println();       
        System.out.println(bean.getClass().getName() +"---------------"+name+"--->This is after bean initialized ");

        return bean;
    }

    @Override
    public Object postProcessBeforeInitialization(Object bean, String name)
            throws BeansException {

        System.out.println(bean.getClass().getName() +"---------------"+name+"----------->This is before bean initialized ");

        return bean;
    }
}

main program

public class MainApp {
    public static void main(String arg[])throws Exception{
        AbstractApplicationContext context = new ClassPathXmlApplicationContext("Bean.xml");        

    }
    }

my output is

com.tutorialspoint.SpellChecker---------------spellChecker----------->This is before bean initialized 

com.tutorialspoint.SpellChecker---------------spellChecker--->This is after bean initialized 

com.tutorialspoint.TextEditor---------------textEditor----------->This is before bean initialized 

com.tutorialspoint.TextEditor---------------textEditor--->This is after bean initialized 

why BeanPostProcessor interface methods not invoked for HelloWorld.java ..,but invoked for other unrelated beans which is not implementing BeanPostProcessor interface ..?