public interface CompactDisc {  public abstract void play();}

@Component("SgtPeppers")public class SgtPeppers implements CompactDisc {  private String  private String artist = "The Beatles";  @Override  public void play() {    System.out.println("playing" + title + " by " + artist);  }}

@Component("CDplayer")//表明該類作為組件類，沒必要顯示的配置Bean實例,括號內為組件名public class CDPlayer {  /*  * @Autowired注解可以用在構造器上，也可以用在set方法上，也能直接放在下列代碼所示地方  * spring會滿足有該注解的依賴，如果只有一個bean匹配依賴需求的話，這個bean就會被裝配進來   @Autowired 默認按類型裝配  * */  @Autowired  private CompactDisc cd;  public CompactDisc getCd() {    return cd;  }  public void setCd(CompactDisc cd) {    this.cd = cd;  }  public void play(){    cd.play();  }}

public class CDPlayerTest {  public static void main(String[] args) {    ApplicationContext context=new ClassPathXmlApplicationContext("applicationContext.xml");    CDPlayer cdPlayer= (CDPlayer) context.getBean("CDplayer");    cdPlayer.play();  }}

<context:component-scan base-package="com.xue.soundsystem"></context:component-scan>