Question

                    for (int i = 1; i <= 100; ++i) {
                        ageList.add(i);
                    }

                    DefaultComboBoxModel<Integer> modelAge = new DefaultComboBoxModel<Integer>();
                    for (Integer i : ageList) {
                        modelAge.addElement(i);
                    }

                    JComboBox<Integer> ageEntries = new JComboBox<Integer>();
                    ageEntries.setModel(modelAge);

                    ageEntries.addItemListener(new ageListener());

  class ageListener implements ItemListener{
    public void itemStateChanged(ItemEvent event) {
         if (event.getStateChange() == ItemEvent.SELECTED) {
                System.out.println("Selected:" + ItemEvent.SELECTED);
            }

    }
  }

Problem: When I choose an age, it prints out 1, regardless of the age I’ve choosed. For example, if I choose the number 7, it prints out 1. If I choose 56, it prints out 1. Any ideas? I’m stumped.

Answer 1

Use this to retrieve the selected item ..

 ((JComboBox)event.getSource()).getSelectedItem();

EDIT: should be ((JComboBox<Integer>)event.getSource()).getSelectedItem(); as you are using generics. And “Yes” this will come inside your event method.

EDIT 2: you are getting the warning because we cannot determine whether JComboBox should have a Generic parameter. Compiler raises this warning because it thinks its unsafe to do such casting.

@SuppressWarnings("unchecked") 
((JComboBox<Integer>)event.getSource()).getSelectedItem();