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spring alias

hi,

I am running below example on spring alias



spring.xml looks as below

<?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" [
<!ENTITY contextInclude SYSTEM "org/springframework/web/portlet/context/WEB-INF/contextInclude.xml">
]>

<beans>
<bean id="triangle" class="org.gp.gpr.Trianglebj">
<property name="pointA" ref="zeroPoint"/>
<property name="pointB">

<bean class="org.gp.gpr.Point">
<property name="x" value="20"/>
<property name="y" value="0"/>
</bean>
</property>


<property name="pointC">
<bean id="point3" class="org.gp.gpr.Point">
<property name="x" value="-200"/>
<property name="y" value="0"/>
</bean>
</property>
</bean>

<bean id="zeroPoint" class="org.gp.gpr.Point">
<property name="x" value="0"/>
<property name="y" value="0"/>
</bean>





<alias name="triangle" alias="triangle-alias"/>
</beans>



clinet java looks as below

package org.gp.gpr;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.FileSystemResource;

public class DrawingAppObj {

      /**
       * @param args
       */
      public static void main(String[] args) {
            //      Triangle triangle=new Triangle();
            //      triangle.draw();


//            BeanFactory factory=new XmlBeanFactory(new FileSystemResource("spring.xml"));
            ApplicationContext context=new ClassPathXmlApplicationContext("spring.xml");
      //      Trianglebj trianglebj      =(Trianglebj) context.getBean("triangle");
            Trianglebj trianglebj      =(Trianglebj) context.getBean("triangle-alias");
            trianglebj.draw();
      }

}
















trinagle obj looks as below

package org.gp.gpr;

public class Trianglebj {
private Point pointA;
private Point pointB;
private Point pointC;
      
      public void draw(){


      //      System.out.println(getType()+"triangle drawed"+getHeight());
            System.out.println("PointA=("+getPointA().getX()+","+getPointA().getY()+")");
            System.out.println("PointB=("+getPointB().getX()+","+getPointB().getY()+")");
      System.out.println("PointC=("+getPointC().getX()+","+getPointC().getY()+")");
      }

      public Point getPointA() {
            return pointA;
      }

      public void setPointA(Point pointA) {
            this.pointA = pointA;
      }

      public Point getPointB() {
            return pointB;
      }

      public void setPointB(Point pointB) {
            this.pointB = pointB;
      }

      public Point getPointC() {
            return pointC;
      }

      public void setPointC(Point pointC) {
            this.pointC = pointC;
      }

      
}

point class looks as below

package org.gp.gpr;

public class Point {
private int x;
public int getX() {
      return x;
}
public void setX(int x) {
      this.x = x;
}
public int getY() {
      return y;
}
public void setY(int y) {
      this.y = y;
}
private int y;

}


My question is what is the purpose of the alias when we have bean id in spring bean definition. I see name also. what is the purposae of name. when we use id?name?alias name? which one is preferred to use

Please advise. Any ideas, resources, sample code highly appreciated. thanks in advance
SOLUTION
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