Introduction

• @Component annotation was introduced in Spring 2.5, which is used for "Annotation-based Configuration" and offering an alternative to XML configuration.
• It is a stereotype annotation used to denote a class as a Spring-managed component (bean). It tells the Spring container to instantiate the class and register it as a bean.
  
  
• Syntax :
  The syntax of @Component is straightforward. It is placed above a class definition:

  import org.springframework.stereotype.Component;
  
  @Component
  public class Student
  {
      // Bean logic goes here
  }

  NOTE : By default, the bean name will be the class name with the first letter lowercased (student in this case).
• We can also specify a custom bean name by providing a value as below :

  @Component("stdObj1")
  public class Student
  {
      // Bean logic goes here
  }

  
  
• NOTE : When using @Component annotation in Spring, we have to use "@ComponentScan" annotation to detect and register @Component-annotated classes as beans.
  
  
• Click Here for @Component Annotation Program.
  
  
• @Component is the base stereotype for three specialized annotations :-
  1. @Controller : It is used in Spring MVC to indicate a controller.
  2. @Service : It indicates a service layer bean.
  3. @Repository : It is used for data access beans.
  
  
• Hierarchy of @Component Annotation :-