Java swing: implementing my Comboboxmodel for JComboBox

问题

I need my combo box to have short names of organizations. The problem is i can see organizations names in dropdown list, but cant actually select it. Where is my mistake?

public class ToComboBoxModel extends AbstractListModel implements ComboBoxModel {
      private String selectedItem;

      private List<Organization> orgs;

      public ToComboBoxModel(List orgs) {
        this.orgs = orgs;
      }

        @Override
      public String getSelectedItem() {

        return selectedItem;
      }

        @Override
      public void setSelectedItem(Object newValue) {
            for (Organization o: orgs){
                if (newValue==o){
                    selectedItem=o.getShortName();
                    break;
                }
            }
      }

        @Override
      public int getSize() {
        return orgs.size();
      }

        @Override
      public String getElementAt(int i) {
        return orgs.get(i).getShortName();
      }
    }

Setting model:

query =session.createQuery("from Organization where isMain = 0");
List orgs=query.list();
toComboBox.setModel(new ToComboBoxModel(orgs));

Thanks in advance!

回答1:

I suspect it's that your setSelectedItem() method compares objects using == rather than .equals()

Consider using a DefaultComboBoxModel which already implements useful methods.

Edit: Also according to the Docs you should be calling all registered ListDataListener objects when setSelected is called.

Using a DefaultComboBoxModel is fairly straightforward. You create a new DefaultComboBoxModel add the elements you want it to contain then call getSelectedItem() to retrieve the element that is currently selected.

来源：https://stackoverflow.com/questions/8254940/java-swing-implementing-my-comboboxmodel-for-jcombobox

标签

java

swing

combobox