java - Using Collections in Spring -

a collection object can created collection object using constructor.

 list<student> list = new arraylist<student>(somestudentlist); 

which can done in spring.

     <bean id="stdarraylist" class="java.util.arraylist">         <constructor-arg >             <list>                 <ref bean="student1" />                 <ref bean="student2" />                 <ref bean="student3" />             </list>         </constructor-arg>     </bean>     <bean id="student1"  class="mawia.test.student"      .... 

how can way of adding item in spring?

 set<student> set= new treeset<student>();         set.add(new student(5, "mawia"));         ... 

so can use constructor accept comparator object.

 set<student> set= new treeset<student>(new mycomparator());         set.add(new student(5, "mawia"));         ... 

i suspect simplest approach create trivial subclass of treeset provides two-argument constructor:

public class mytreeset<t> extends treeset<t> {   public mytreeset(comparator<? super t> cmp, collection<? extends t> coll) {     super(cmp);     addall(coll);   } } 

and use type of bean, passing both comparator , initial values <constructor-arg> values.

<bean id="studentset" class="com.example.mytreeset">   <constructor-arg index="0">     <bean class="com.example.mycomparator" />   </constructor-arg>   <constructor-arg index="1">     <list>       <ref bean="student1" />       <ref bean="student2" />       <ref bean="student3" />     </list>   </constructor-arg> </bean> 

or instead of subclass of treeset write own factorybean.

to without writing additional code use second bean definition adding

<bean id="studentset" class="java.util.treeset">   <constructor-arg>     <bean class="com.example.mycomparator" />   </constructor-arg> </bean>  <bean id="studentsetfiller" factory-bean="studentset" factory-method="addall">   <constructor-arg>     <list>       <ref bean="student1" />       <ref bean="student2" />       <ref bean="student3" />     </list>   </constructor-arg> </bean> 

but other bean inject studentset needs additional depends-on="studentsetfiller" make sure set populated before target bean tries use it.