spring中<bean>中parent标签的使用

package com.timo.domain;

public class Parent {
    private String name;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

package com.timo.domain;

public class Child {
    private String name;
    private String age;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAge() {
        return age;
    }

    public void setAge(String age) {
        this.age = age;
    }
}

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

    <bean id="parent" class="com.timo.domain.Parent">
        <property name="name" value="ouyangfeng"/>
     </bean>
    <!--下面的parent表示这个child的bean的父亲是id=parent的这个类-->
    <bean id="child" class="com.timo.domain.Child" parent="parent">
        <property name="age" value="18"/>
     </bean>
</beans>

package com.timo.test;

import com.timo.domain.Child;
import com.timo.domain.Parent;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class Test17 {
    public static void main(String[] args) {
        ClassPathXmlApplicationContext applicationContext = new ClassPathXmlApplicationContext("applicationContext-chilld-parent.xml");
        Child parent = applicationContext.getBean(Child.class);
        System.out.println("name="+parent.getName());
        System.out.println("age="+parent.getAge());
    }
}