06-Using-Constructor-Injection

Drawing.java

package org.yash.watertechsol;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

public class DrawingApp {

      public static void main(String[] args){

            ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml");

            Triangle triangle = (Triangle)context.getBean("triangle");

            triangle.draw();

      }

}

Triangle.java

package org.yash.watertechsol;

public class Triangle {

     

      private String type;

      private int height;

     

      public Triangle(String type){

            this.type=type;

      }

      public Triangle(String type, int height){

            this.type=type;

            this.height=height;

      }

      public Triangle(int height){

            this.height=height;

      }

     

      public int getHeight() {

            return height;

      }

      public void draw(){

            System.out.println(getType() + " Trianble drawn of height " + getHeight());

      }

      /*comment this this setter because we are not setting any property in xml*/

      /*

      public void setType(String type) {

            this.type = type;

      }

      */

      public String getType() {

            return type;

      }

}

spring.xml

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

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

<beans>

      <!-- It is blue print to object -->

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

            <!-- constructor do not have name attribute -->

            <!--

            <constructor-arg value="Equilateral"></constructor-arg>

             -->

             <!--

            <constructor-arg type="int" value="20"></constructor-arg>

             -->

             <!--

            <constructor-arg type="java.lang.String" value="20">

</constructor-arg>

             -->

            <constructor-arg index="0" value="Equilateral"></constructor-arg>

            <constructor-arg index="1" value="20"></constructor-arg>

             

      </bean>

</beans>