package soundsystem;
public class Dog {
private String Cry;//叫聲
//用setter方法注入
public void setCry(String cry) {
  Cry = cry;
}
//定義一個狗叫方法
  public void DogCry(){
    System.out.println("狗叫："+Cry);
    Cat.CatCry();
    catEat.CatEating();
  }
}

package soundsystem;
public class Cat {
  private String Cry;//叫聲

//用構造函數(shù)注入
  public Cat(String cry){
    this.Cry=cry;
  }

//定義一個貓叫方法
  public void CatCry(){
    System.out.println("貓叫："+Cry);
  }
}

<?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">

  <bean id="Dog" class="soundsystem.Dog">
    <property name="Cry" value="汪汪汪~"></property>
    <property name="Cat" ref="Cat"></property>
  </bean>

  <bean id="Cat" class="soundsystem.Cat">
    <constructor-arg value="喵~"></constructor-arg>
  </bean>

</beans>

package Test;

import org.junit.runner.RunWith;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import soundsystem.Cat;
import soundsystem.Dog;

@RunWith(SpringJUnit4ClassRunner.class)
public class Test {

  @org.junit.Test
  public static void main(String[] args) {
    ApplicationContext ap=new ClassPathXmlApplicationContext("config/Bean_DogXML.xml");
    Dog dog=(Dog)ap.getBean("Dog");
    dog.DogCry();
  }
}