Adding items to a JComboBox

Question

I use a combo box on panel and as I know we can add items with the text only      comboBox addItem  item text      But some times I need to use some value of the item and item text like in html select        lt select gt  lt option value  item value  gt Item Text lt  option gt  lt  select gt    Is there any way to set both value and title in combo box item   For now I use a hash to solve this issue

User · Accepted Answer

Wrap the values in a class and override the toString() method.

class ComboItem
{
    private String key;
    private String value;

    public ComboItem(String key, String value)
    {
        this.key = key;
        this.value = value;
    }

    @Override
    public String toString()
    {
        return key;
    }

    public String getKey()
    {
        return key;
    }

    public String getValue()
    {
        return value;
    }
}

Add the ComboItem to your comboBox.

comboBox.addItem(new ComboItem("Visible String 1", "Value 1"));
comboBox.addItem(new ComboItem("Visible String 2", "Value 2"));
comboBox.addItem(new ComboItem("Visible String 3", "Value 3"));

Whenever you get the selected item.

Object item = comboBox.getSelectedItem();
String value = ((ComboItem)item).getValue();

User · Answer

You can use any Object as an item  In that object you can have several fields you need  In your case the value field  You have to override the toString   method to represent the text  In your case  item text   See the example   public class AnyObject        private String value      private String text       public AnyObject String value  String text            this value   value          this text   text                   Override     public String toString             return text           comboBox addItem new AnyObject  item value    item text

User · Answer

create a new class called ComboKeyValue java     public class ComboKeyValue           private String key          private String value               public ComboKeyValue String key  String value                this key   key              this value   value                              Override         public String toString                return key                         public String getKey                 return key                         public String getValue                 return value               when you want to add a new item  just write the code as below  DefaultComboBoxModel model   new DefaultComboBoxModel        model addElement new ComboKeyValue  quot key quot    quot value quot         properties setModel model

User · Answer

You can use String arrays to add jComboBox items  String    items      First item    Second item    Third item    Fourth item      JComboBox comboOne   new JComboBox  items

User · Answer

addItem Object  takes an object  The default JComboBox renderer calls toString   on that object and that s what it shows as the label    So  don t pass in a String to addItem    Pass in an object whose toString   method returns the label you want  The object can contain any number of other data fields also   Try passing this into your combobox and see how it renders  getSelectedItem   will return the object  which you can cast back to Widget to get the value from   public final class Widget       private final int value      private final String label       public Widget int value  String label            this value   value          this label   label             public int getValue             return this value             public String toString             return this label

User · Answer

Method call setSelectedIndex  item value    doesn t work because setSelectedIndex use sequential index

[java] Adding items to a JComboBox

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