import java.util.ArrayList

 declare Item
     code: int
     price: int
     present: boolean
 end

 rule "Init"
 when
 then
     insert(new Item(1,40,false));
     insert(new Item(2,40,false));
     insert(new Item(3,40,false));
     insert(new Item(4,40,false));
 end

 rule "CollectAndAccumulateRule"
 when
     //At least two items that aren't presents
     objList: ArrayList(size>=2) from collect( Item(present==false))
     //Total price bigger than 100
     price: Number(intValue>=100) from accumulate( Item($w:price, present==false), sum($w))
 then

     System.out.println("Sum: "+price);
     System.out.println("Items size: "+objList.size());
     
     //Look for the minor price item
     Item min = null;
     for(Object obj: objList){
         if (min!=null){
             min = (min.getPrice()>((Item)obj).getPrice())?(Item)obj:min;
         }
         else {
             min = (Item)obj;
         }
     }
     
     //And make it a present
     if (min!=null){
         modify(min){setPresent(true)};
     }
 end