Databases
StackOverflow2013
Postsdbo
POThe Stubborn JComboBox
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POThe Stubborn JComboBox
    primarykey
    data
    text
    <p>I have a JComboBox shown in the code below. When the program starts its actionPerformed event fires up immediately causing some null pointer exceptions so I want to start with none of the elements selected. However, for some reason it does not work (it always start with displaying "USD/TRY" whatever I do). Anyone has any idea ?</p> <pre><code>JComboBox comboBox = new JComboBox(new String[]{"USD/TRY", "EUR/TRY", "GBP/TRY"}); comboBox.setSelectedIndex(-1); // doesnt change anything comboBox.setSelectedIndex(2); // doesnt change anything comboBox.setSelectedItem(null); // doesnt change anything </code></pre> <p>UPDATE: Building the combo box like below doesnt change anything either</p> <pre><code>JComboBox comboBox = new JComboBox(); comboBox.addItem("USD/TRY"); comboBox.addItem("EUR/TRY"); comboBox.addItem("GBP/TRY"); </code></pre> <p>Here is the SSCCE:</p> <pre><code>public class MainFrame { private final JTextArea textArea = new JTextArea(); private IExchangeSource s; public MainFrame(final IExchangeSource s) { //build gui final JComboBox comboBox = new JComboBox(); comboBox.addItem("USD/TRY"); comboBox.addItem("EUR/TRY"); comboBox.addItem("GBP/TRY"); comboBox.setSelectedIndex(-1); // doesnt change anything //comboBox.setSelectedIndex(2); // doesnt change anything JFrame f = new JFrame("Currency Converter"); JPanel p = new JPanel(new BorderLayout()); textArea.setName("textarea"); textArea.setWrapStyleWord(true); textArea.setLineWrap(true); this.s = s; comboBox.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { String exchange = (String) comboBox.getSelectedItem(); s.getData(exchange); } }); p.add(comboBox, BorderLayout.NORTH); p.add(textArea, BorderLayout.CENTER); f.setPreferredSize(new Dimension(300, 300)); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.pack(); f.add(p); comboBox.setSelectedIndex(0); f.setVisible(true); } } </code></pre>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. UStrashgod
    1. USCemre
    plurals
    1. This table or related slice is empty.
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POThe Stubborn JComboBox
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POThe Stubborn JComboBox
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POThe Stubborn JComboBox
      1. This table or related slice is empty.
      1. VTUpMod
    1. COTry loading the String[] after creating the JComboBox?
      singulars
      1. POThe Stubborn JComboBox
      1. USGilbert Le Blanc
    2. COTried and it doesnt work either =/ I updated the question accordingly. thanks
      singulars
      1. POThe Stubborn JComboBox
      1. USCemre
    3. COHaving the stack trace of the exception would help. How could you add an ActionListener to a combo box which hasn't been created yet?
      singulars
      1. POThe Stubborn JComboBox
      1. USJB Nizet
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload