package com.springexample;

import java.util.Iterator;

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");
		StudentHolder studentHolder = (StudentHolder) context.getBean("studentHolder");
		
		for (Iterator studentIterator = studentHolder.getStudents().iterator(); studentIterator.hasNext(); ){
			Student student = studentIterator.next();
			System.out.println("Student Details");
			System.out.println("---------------");
			System.out.println("Student No: "+student.getStudentNo());
			System.out.println("Student Name: "+student.getStudentName());
			System.out.println();
		}
	}
}

package com.springexample;

import java.util.HashSet;
import java.util.Set;

public class StudentHolder {
	Set students = new HashSet();

	public Set getStudents() {
		return students;
	}

	public void setStudents(Set students) {
		this.students = students;
	}
}

<?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-3.0.xsd">

	<bean id="student1" class="com.springexample.Student" p:studentNo="1001" p:studentName="John" />
	<bean id="student2" class="com.springexample.Student" p:studentNo="1002" p:studentName="Peter" />
	<bean id="student3" class="com.springexample.Student" p:studentNo="1003" p:studentName="Viva" />

	<bean id="studentHolder" class="com.springexample.StudentHolder">
		<property name="students">
			<set>
				<ref bean="student1" />
				<ref bean="student2" />
				<ref bean="student3" />
				<ref bean="student2" />
			</set>
		</property>
	</bean>
</beans>

package com.springexample;

public class Student {
	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;
	}	
}