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POSpring is picking an interface implementation out of many, on its own?
 

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    <p>Friends below is my code, I am trying to run dependency Injection with Spring</p> <p>I have an interface, two class implementations of that interface.</p> <p>One bean.xml and One main method class.</p> <p>Interface IWriter.java</p> <pre><code>package DI; public interface IWriter { public void writer(String s); } </code></pre> <p>Class Writer.java</p> <pre><code> package DI; import org.springframework.stereotype.Service; @Service public class Writer implements IWriter { public void writer (String s){ System.out.println(s); } } </code></pre> <p>Class NiceWriter.java</p> <pre><code>package DI; import org.springframework.stereotype.Service; @Service public class NiceWriter implements IWriter { public void writer (String s){ System.out.println("The string is " + s); } } </code></pre> <p>Another class</p> <pre><code>package DI; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.beans.factory.annotation.Qualifier; import org.springframework.stereotype.Service; @Service public class MySpringBeanWithDependency { @Autowired private IWriter writer; public void run() { String s = "This is my test"; writer.writer(s); } } </code></pre> <p>Main.java</p> <pre><code>package DI; import org.springframework.beans.factory.BeanFactory; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import DI.MySpringBeanWithDependency; public class Main { public static void main(String[] args) { ApplicationContext context = new ClassPathXmlApplicationContext("beans.xml"); BeanFactory factory = context; MySpringBeanWithDependency test = (MySpringBeanWithDependency) factory.getBean("mySpringBeanWithDependency"); test.run(); } } </code></pre> <p>bean.xml</p> <pre><code> &lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;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-2.5.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd"&gt; &lt;context:component-scan base-package="DI" /&gt; &lt;/beans&gt; </code></pre> <p>When I run the code Spring container gives the output of the method of Writer.java class. I haven't anywhere specified which implementation to pick. How is Spring picking up the implementation of Writer.java??</p>
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