Array of two VO whit same field

Question

I have 2 VO on my app, one of this is like that
id string, numberOfItems
that VO is filled whit data like that
id items
[1][100]
[2][50]
[3][200]
[3][70]
[4][80]
[3][45]
[5][30]
[5][20]
[5][60]
i want to place this data in a second VO but grouping the data whit same ID and sum the total items, to get some like that
[1][100]
[2][50]
[3][315]
[4][80]
[5][130]
can som1 plz help me, i'm just 3 weeks of experiense whit J2EE and Java

Answer 1

was done!
int x=0;
for(int vo1=0; vo1<y ; vo1++){
     String auxA = itemsInventoryFull[vo1].getID();
     int aux=0;
     try {
          for (int i=0;i<totalOfUniqueItems;i++) {
               String aux1=auxA;
               String aux2=itemsInventory.getID();
               if (aux1.equalsIgnoreCase(aux2)) {
                    if (aux < 1) { aux = i; };
     } catch (Exception ex) {}
     if (aux==0) {
          itemsInventory[x] = new itemsInventoryVO();
          itemsInventory[x].setID(itemsInventoryFull[vo1].getID());
          itemsInventory[x].setRemuneracionImponible(itemsInventoryFull[vo1].getItems());
          x++;
     } else {
          itemsInventory[aux].setID(itemsInventoryFull[vo1].getID());
          double totalItems = itemsInventoryFull[vo1].getItems() + itemsInventory[aux].getItems();
          itemsInventory[aux].setItems(totalItems);