Java Utililty Methods JComboBox

List of utility methods to do JComboBox

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Description

The list of methods to do JComboBox are organized into topic(s).

Method

booleancomboContainsElement(JComboBox combo, String element)
Return true if the combo contains the element, return false otherwise 
for (int i = 0; i < combo.getItemCount(); i++) {
    if (combo.getItemAt(i).equals(element)) {
        return true;
return false;
booleancontains(JComboBox jcb, Object o, boolean caseSensitive)
contains 
if (o == null)
    return false;
if (caseSensitive || !(o instanceof String)) {
    for (int i = 0; i < jcb.getItemCount(); i++)
        if (jcb.getItemAt(i).equals(o))
            return true;
} else {
    String s = ((String) o).toLowerCase();
...
JComponentcreateLabelCombo(String label, JComboBox comboBox)
Create a GUI component JLabel + JComboBox with a left and right margin (5px) 
JPanel labelCombo = new JPanel();
labelCombo.setLayout(new FlowLayout(FlowLayout.LEFT, 0, 0));
JLabel caption = new JLabel(label);
caption.setBorder(new EmptyBorder(0, 5, 0, 5));
labelCombo.add(caption);
labelCombo.add(comboBox);
return labelCombo;
ActionListener[]disableListenersForComboBox(JComboBox comboBox)
disable Listeners For Combo Box 
ActionListener[] listeners = comboBox.getActionListeners();
for (ActionListener listener : listeners) {
    comboBox.removeActionListener(listener);
return listeners;
voidensureCustomBackgroundStored(JComboBox comp)
ensure Custom Background Stored 
if (getStoredBackground(comp) != null)
    return;
Color background = comp.getBackground();
if ((background == null) || (background instanceof UIResource) || (background == WARNING_BACKGROUND)
        || (background == ERROR_BACKGROUND))
    return;
comp.putClientProperty(STORED_BACKGROUND_KEY, background);
booleanexist(JComboBox x)
Return true if the list is not empty, false otherwise 
if (x.getSelectedIndex() == -1) {
    JOptionPane.showMessageDialog(x, "Empty list.", "Message", JOptionPane.ERROR_MESSAGE);
    return false;
return true;
voidfixComboOrientation(JComboBox combo)
Fixes the orientation of the renderer of a combo box. 
ListCellRenderer r = combo.getRenderer();
if (r instanceof Component) {
    ComponentOrientation o = ComponentOrientation.getOrientation(Locale.getDefault());
    ((Component) r).setComponentOrientation(o);
JComboBoxgenerateComboBoxFor(Object... objs)
generate Combo Box For 
Container c = search(objs, Container.class);
ComboBoxModel model = null;
Vector items = null;
Object[] itms = null;
Border border = search(objs, Border.class);
Color color = search(objs, Color.class);
ComboBoxUI ui = search(objs, ComboBoxUI.class);
JComboBox combo = (model = search(objs, ComboBoxModel.class)) == null
...
JComboBoxgetAgeComboBox()
get Age Combo Box 
JComboBox<Integer> jcb = new JComboBox<Integer>();
for (int id : age.keySet()) {
    jcb.addItem(id);
return jcb;
ColorgetComboBoxDisabledBackground()
get Combo Box Disabled Background 
return UIManager.getColor("ComboBox.disabledBackground");