package com.springexample;

public class StudentAdditionalDetails implements StudentAdditionalDetailsImpl {
	private String city;
	private String country;
	
	public String getCity() {
		return city;
	}
	public void setCity(String city) {
		this.city = city;
	}
	public String getCountry() {
		return country;
	}
	public void setCountry(String country) {
		this.country = country;
	}
	
	public void showAdditionalDetails(){
		System.out.println(this.city);
		System.out.println(this.country);
	}
}

package com.springexample;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class RunMyProgram {
	public static void main(String[] args) {
		ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");
		StudentAdditionalDetailsImpl studentAdditionalDetails = (StudentAdditionalDetailsImpl) context.getBean("studentAdditionalDetails");
		((StudentImpl) studentAdditionalDetails).showDetails();
		studentAdditionalDetails.showAdditionalDetails();
	}
}

package com.springexample;

public interface StudentImpl {
	public void showDetails();
}

<?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:aop="http://www.springframework.org/schema/aop"
	xmlns:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
		http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">

	<bean id="student" class="com.springexample.Student">
		<property name="studentNo" value="1001" />
		<property name="studentName" value="John Peter" />
	</bean>
	
	<bean id="studentAdditionalDetails" class="com.springexample.StudentAdditionalDetails">
		<property name="city" value="Newyork" />
		<property name="country" value="America" />
	</bean>
	
	<aop:config>
		<aop:aspect>
			<aop:declare-parents types-matching="com.springexample.StudentAdditionalDetailsImpl+" 
								 implement-interface="com.springexample.StudentImpl" 
								 delegate-ref="student" />
		</aop:aspect>
	</aop:config>

</beans>

package com.springexample;

public interface StudentAdditionalDetailsImpl {
	public void showAdditionalDetails();
}

package com.springexample;

public class Student implements StudentImpl {
	private int studentNo;
	private String studentName;
	
	public int getStudentNo() {
		return studentNo;
	}
	public void setStudentNo(int studentNo) {
		this.studentNo = studentNo;
	}
	public String getStudentName() {
		return studentName;
	}
	public void setStudentName(String studentName) {
		this.studentName = studentName;
	}	
	
	public void showDetails(){
		System.out.println(this.studentNo);
		System.out.println(this.studentName);
	}
}