Doubt in wiring up beans

[Mahalakshmi Chandru]

Hi all,
I'm a newbie learning Spring frmaework using the book 'Beginning Spring Framework 2'..The concept of wiring the beans together has been explained using the below program in Chapter 1.

   
package com.wrox.begspring;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class CalculateSpring{

	private Operation ops;
	private ResultWriter wtr;

	public void setOps(Operation ops){
		this.ops = ops;
	}

	public void setWriter(ResultWriter wtr){
		this.wtr = wtr;
	}

	public static void main(String[] args){
		ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
		BeanFactory factory = (BeanFactory)context;

		CalculateSpring calc = (CalculateSpring) factory.getBean("opsbean");
		calc.execute(args);
	}

	public void execute(String[] args){
		long l1 = Long.parseLong(args[0]);
		long l2 = Long.parseLong(args[1]);

		wtr.showResult("The result of " + l1 + ops.getOptsName()+ l2 + " is "+ ops.operate(l1,l2));
	}


}

Could anyone(who has read this book) explain , when the methods : setOps and setWriter gets called..Thanks in advance.

[Mahalakshmi Chandru]

All,
I got to unserstand as i kept studying the book. The setter() methods are used for dependency injection. Im clear now

[Hong Anderson]

Thanks for the update.