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Is there a way to add entries into a combobox and check they are not repeated?

Posted on 2004-04-11
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Last Modified: 2010-03-31
That's actually my question. I'm using Netbeans 3.6, thanks
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Question by:hacktek
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Expert Comment

by:mmuruganandam
ID: 10803684
You have to extend the "javax.swing.DefaultComboBoxModel" and have to write your custom model.

in the addElement method, you have to check for the element's existence, if it is not present,
then you can add the element.


Otherwise, you can ignore the element.


Regards,
Muruga
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LVL 9

Accepted Solution

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mmuruganandam earned 35 total points
ID: 10803708
import java.util.Vector;

import javax.swing.DefaultComboBoxModel;

public class UniqueElementComboBoxModel extends DefaultComboBoxModel
{
      public UniqueElementComboBoxModel()
      {
            super();
      }

      public UniqueElementComboBoxModel(Object items[])
      {
            this();

            int i, c;
            for (i = 0, c = items.length; i < c; i++)
                  addElement(items[i]);

            if (getSize() > 0)
            {
                  setSelectedItem(getElementAt(0));
            }
      }

      public UniqueElementComboBoxModel(Vector v)
      {
            this();

            int size = v.size();

            for (int i = 0; i < size; i++)
            {
                  addElement(v.get(i));
            }

            if (getSize() > 0)
            {
                  setSelectedItem(getElementAt(0));
            }
      }

      public void addElement(Object anObject)
      {
            if (getIndexOf(anObject) < 0)
            {
                  super.addElement(anObject);
            }
      }

      public void insertElementAt(Object anObject, int index)
      {
            if (getIndexOf(anObject) < 0)
            {
                  super.insertElementAt(anObject, index);
            }
      }
}


Here is the model, that maintains the uniqueness of the data.


Regards,
Muruga
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