public class MyFirstSpringProjectApplication {

	public static void main(String[] args) {
		ApplicationContext context =  new ClassPathXmlApplicationContext("spring.xml");
		laptop obj=(laptop) context.getBean("alien2");
		obj.DisplayCPU();


	}
}

package com.javalearnings.MyFirstSpringProject;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;


public class laptop {
    Cpu cpu;
    public laptop() {
        System.out.println("Laptop Constructor");
    }

    public void setCpu(Cpu cpu) {
        this.cpu = cpu;
    }

    public void DisplayCPU()
    {
        System.out.println(" iam from Laptop");
        cpu.print();
    }
}


package com.javalearnings.MyFirstSpringProject;

import org.springframework.stereotype.Component;


public class Cpu {
    public Cpu() {
        System.out.println("Cpu Constructor");
    }
    public void print ()
    {
        System.out.println("Iam CPU");
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <!-- Define Laptop bean with a CPU dependency -->
    <bean id="alien1" class="com.javalearnings.MyFirstSpringProject.laptop">

    </bean>

    <!-- Define another Laptop bean -->
    <bean id="alien2" class="com.javalearnings.MyFirstSpringProject.laptop">
        <property name="cpu" ref="alien3" />
    </bean>

    <!-- Define CPU bean -->
    <bean id="alien3" class="com.javalearnings.MyFirstSpringProject.Cpu"></bean>

</beans>