IOC(Inversion of control)is a technique that allows object 
configuration to be moved out of code and into a 
configuration file. With Spring IOC, this is typically done 
with an XML file. 
The steps to use Spring IOC are: 

1. Write Java Bean classes, with getter and setter methods 
for each property to be configured by Spring. 
2. Create an XML file that describes the Java Beans to be 
configured. 
3. Use an XMLBeanFactory to create configured beans. There 
are other ways to read bean descriptions, but using an 
XmlBeanFactory is more common.