Spring Framework

<?xml version="1.0" encoding="UTF-8"?>
<beans
xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans
	http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">
<bean id="a1" class="org.r4r.A"/>
<bean id="a2" class="org.r4r.A">
<constructor-arg value="10"/>
</bean>
<bean id="a3" class="org.r4r.A">
<property name="a" value="100"/>
</bean>
</beans>

package org.r4r;
public class A {
int a;
public A(int a) {
super();
this.a = a;
System.out.println("A is instantiated using parameter constructor.");
System.out.println("Value of a:-\t"+a);
}
public A() {
super();
System.out.println("A is instantiated using Default constructor.");
}
public void setA(int a) {
this.a = a;
System.out.println("Value of A is set by setA() method.");
System.out.println("Value of a:-\t"+a);
}
}

package org.r4r;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.xml.XmlBeanFactory;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
public class Test {
public static void main(String[] args) {
Resource r=new ClassPathResource("applicationContext.xml");
BeanFactory f=new XmlBeanFactory(r);
//A a1=(A)f.getBean("a1");
@SuppressWarnings("unused")
A a2=(A)f.getBean("a2");
@SuppressWarnings("unused")
A a3=(A)f.getBean("a3");
}
}