18-Introduction-to-Annotations-and-the-Required-Annotation

You can configure properties using annotation also.

@Required – by using this annotation you can skip property configuration from XML, annotation has to set before setter method.

      @Required

      public void setCenter(Point center) {

            this.center = center;

      }

<bean id="circle" class="org.yash.watertechsol.Circle"></bean>

You need to add below annotation class configuration in XML to use annotations in class files.

<bean class="org.springframework.beans.factory.annotation.RequiredAnnotationBeanPostProcessor"></bean>

spring.xml

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN" "http://www.springframework.org/dtd/spring-beans-2.0.dtd">

<beans>

           

      <bean id="triangle" class="org.yash.watertechsol.Triangle">

            <property name="pointA" ref="pointA"></property>

            <property name="pointB" ref="pointB"></property>

            <property name="pointC" ref="pointC"></property>

      </bean>

      <bean id="circle" class="org.yash.watertechsol.Circle">

      </bean>

     

      <bean id ="pointA" class="org.yash.watertechsol.Point">

            <property name="x" value="0" />

            <property name="y" value="0" />

      </bean>

     

      <bean id ="pointB" class="org.yash.watertechsol.Point">

            <property name="x" value="-20" />

            <property name="y" value="0" />

      </bean>

      <bean id ="pointC" class="org.yash.watertechsol.Point">

            <property name="x" value="0" />

            <property name="y" value="20" />

      </bean>    

     

      <bean class="org.springframework.beans.factory.annotation.RequiredAnnotationBeanPostProcessor"></bean>

</beans>

Circle.java

package org.yash.watertechsol;

import org.springframework.beans.factory.annotation.Required;

public class Circle implements Shape {

      private Point center;

      @Override

      public void draw() {

            System.out.println("Drawing Circle");

            System.out.println("("+center.getX()+", "+center.getY()+")");

      }

     

      public Point getCenter() {

            return center;

      }

     

      @Required

      public void setCenter(Point center) {

            this.center = center;

      }

}