Geek asks and answers

How the <list> tag works in spring

I have Collection tools; in my SomeClass.java, and I declare in my temp.xml bean of the class SomeClass.java. In xml, I add two string objects to the collection.

My question is: Collection is an interface, so I can't create it, and List is also an interface, so I don't think we can do

 Collection<String> someCollection = new List<String>();

I would like to know how java code works when we use the list tag in an XML file. So the objects are stored in a linked list or in an arraylist or in some kind of list?

+5
source share
2 answers

ApplicationContext. , , List. Accoding :

. bean ListFactoryBean, , . bean - , , list-class , List . list-class , ApplicationContext .

<util:list id="messageUtilList">
    <ref bean="stringMessage01"/>
    <ref bean="stringMessage02"/>
    <value>Spring is fun to learn.</value>
</util:list>

<util:list id="messageUtilLinkedList" 
           list-class="java.util.LinkedList">
    <ref bean="stringMessage01"/>
    <ref bean="stringMessage02"/>
    <value>Spring is fun to learn.</value>
</util:list>

ListFactoryBean, , ArrayList - , , . , :

if (this.targetListClass != null) {
    result = (List) BeanUtils.instantiateClass(this.targetListClass);
}
else {
    result = new ArrayList(this.sourceList.size());
}
+11

Spring IOC Container ArrayList . LinkedHashSet, LinkedHashMap.

0

More articles:


All Articles