Null And Empty
Spring Inversion of Control (IoC ) also known as
Dependency Injection (DI ) is a process by which
objects define their dependencies with collaborating objects.
The following example shows injecting null and empty values.
package com.bethecoder.tutorials.spring3.basic; public class SimpleBean { private String simpleProp; public String getSimpleProp () { return simpleProp; } public void setSimpleProp ( String simpleProp ) { this .simpleProp = simpleProp; } }
package com.bethecoder.tutorials.spring3.tests.gen; import org.springframework.beans.factory.xml.XmlBeanFactory; import org.springframework.core.io.ClassPathResource; import com.bethecoder.tutorials.spring3.basic.SimpleBean; public class EmptyAndNullTests { /** * @param args */ public static void main ( String [] args ) { XmlBeanFactory factory = new XmlBeanFactory ( new ClassPathResource ( "empty_null.xml" )) ; SimpleBean emptyValue = ( SimpleBean ) factory.getBean ( "emptyValue" ) ; System.out.println ( "emptyValue : " + emptyValue.getSimpleProp ()) ; SimpleBean nullValue = ( SimpleBean ) factory.getBean ( "nullValue" ) ; System.out.println ( "nullValue : " + nullValue.getSimpleProp ()) ; } }
emptyValue :
nullValue : null
