Wiring collections , from java in action

最新推荐文章于 2021-06-15 10:21:19 发布

女雅乱

最新推荐文章于 2021-06-15 10:21:19 发布

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分类专栏： SSH 文章标签： Java Bean XML

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本文介绍了一个使用表演者模式实现的单乐队类，该类通过集合存储乐器实例并执行演奏行为。通过Spring框架配置文件定义了乐队及其中包含的不同乐器。演示了列表和集合在乐器实例存储上的区别。

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The method implements:

public class SingleBand implements Performer{

	public SingleBand(){}
	
	private Collection<Instrument> instruments;
	
	public void setInstrument(Collection<Instrument> instruments){
		this.instruments = instruments;
	}
	
	public void perform() {
		// TODO Auto-generated method stub
		for(Instrument instrument: instruments){
			instrument.play();
		}
	}

}

the bean settings:

    <bean id="band" class="com.performence.SingleBand">
       <property name="instrument">

         <list>
           <ref bean='piano'/>
           <ref bean='voilin'/>
           <ref bean='piano'/>
           <ref bean='voilin'/>
         </list>
       </property>
    </bean>
   <bean id="piano" class="com.performence.Piano"/>
   <bean id="voilin" class="com.performence.Violin"/>
   
</beans>

test method :

   public static void main(String args[]){
	   BeanFactory factory = new XmlBeanFactory(new FileSystemResource("bean.xml"));
	   Performer per = (Performer)factory.getBean("band");
	   per.perform();
   }
}

output:

   piano playing.......
   violin playing.......
   piano playing.......
   violin playing.......

if change the <list> to <set> in the bean.xml

output :

piano playing.......
violin playing.......