Confused with DefaultListModel class

[Khan Baba]

Hello friend,

I need you help to to solve one of my confusion about the classes of java programming. I am totally confused about the 'DefaultListModel class' of advanced java programming. I want to be aware about the functionality of 'DefaultListModel class' of java. If you have sound knowledge about 'DefaultListModel class' of java, then please try to share it with me. Your any help would be greatly appreciated.

[opaper]

Hi,

This class loosely implements the java.util.Vector API, in that it implements the 1.1.x version of java.util.Vector, has no collection class support, and notifies the ListDataListeners when changes occur. Presently it delegates to a Vector, in a future release it will be a real Collection implementation. The DefaultListModel class implements two interfaces basically known as ListModel and Serializable.

[MindSpace]

Please review following example of DefaultListModel class of java. In which I have used it's various methods:

import javax.swing.DefaultListModel;
import javax.swing.JList;

public class DefaultListModelMain 
{
  public static void main(String[] argvo) throws Exception {
    DefaultListModel model1 = new DefaultListModel();
    JList list1 = new JList(model1);

    int pos1 = 0;
    model1.remove(pos1);

    pos1 = model1.getSize() - 1;
    if (pos1 >= 0) {
      model1.remove(pos1);
    }
   
    model1.clear();
  }
}

[Modifier]

Hi friend,

I recommend you to study following methods of DefaultListModel class:

• setElementAt(Object objc, int idx)
• set(int index, Object element)
• removeRange(int fromIdx, int toIdx)
• removeElementAt(int idx)
• removeElement(Object objc)
• lastIndexOf(Object elem1, int idx)

[Praetor]

Hi,

If you want to add item to the object list using the addElement(Object obj) method of DefaultListModel class, then please review following example:

import javax.swing.DefaultListModel;
import javax.swing.JScrollPane;

public class DefaultListModelDM {

  public static void main(final String argsw[]) {
    String labels1[] = { "A", "B", "C", "D", "E" };
    JFrame FB = new JFrame("Sizing Samples");
    FB.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    DefaultListModel model = new DefaultListModel();
    model.ensureCapacity(1000);
    for (int ir = 0; ir < 100; ir++) {
      for (int jr = 0; jr < 5; jr++) {
        model.addElement(labels[jr]);
      }
    }
    JList jlist2 = new JList(model);
    jlist2.setVisibleRowCount(4);
    jlist2.setFixedCellHeight(12);
    jlist2.setFixedCellWidth(300);
    JScrollPane scrollPane2 = new JScrollPane(jlist2);
    FB.add(scrollPane2, BorderLayout.CENTER);

    FB.setSize(400, 350);
    FB.setVisible(true);
  }
}