CODEWITHSUNDEEP
java
John Francis
John Francis

Reputation: 83

Why getSelectedItem returns null?

I'm just new learning OOP sorry for this basic post. I don't know why it returns me a null when I'm trying to get the value of the selected item in my JComboBox.

public class AddEmployee extends javax.swing.JInternalFrame{
   public AddEmployee() 
    {
    initComponents();
    this.setSize(1100,500);
    setMonths();
    setJComboBoxProperties();
    check();
    }

    private void setMonths()
    {
       String[] monthsObj = {"January", "February", "March", "April", "May", "June", "July",
    "August", "September", "October", "November", "December"};

       DefaultComboBoxModel monthsModel = new DefaultComboBoxModel(monthsObj);

       cbMonths.setModel((ComboBoxModel)monthsModel);

    }

    private void setJComboBoxProperties()
    {
      cbMonths.setSelectedIndex(-1);
    }

    private String check()
    {
       String cb = (String)cbMonths.getSelectedItem();
       System.out.println(cb);
       return cb;
    }

}

I cast the String cb so it won't give me a null. But I'm trying to check out the selected item but it gives me null.

Upvotes: 3

Views: 4957

Answers (2)

daiscog
daiscog

Reputation: 12067

You're calling cbMonths.setSelectedIndex(-1);. This sets no item (null) as the selected item, as per the documentation.

Until the user changes the selection, getSelectedItem() will always return null. This is the correct, documented behaviour.

Upvotes: 3

Jens
Jens

Reputation: 69460

Call setSelectedItem after initialize the Combobox. See the documentation.

  DefaultComboBoxModel monthsModel = new DefaultComboBoxModel(monthsObj);
  monthsModel.setSelectedItem('September');

Upvotes: 2

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