Displaying large amount of data with JList?

Question

I have a JList, wich must display more than 3000 items. I wish to have \"visible\" around 100 items in the list, and when you scroll and getting close to the end (or begining) o

Answer 1

no there are no simple way for that, you have to implements Pagination(s)

• easiest job when is managed by Databases engine, most of then support paginations directly

• in the Model, but I never seen workaround for XxxListModel, use JTable with one Colum instead, there are some good workaround for Pagination for JTable

Answer 2

The list is rendering only the visible part. So there is no overhead from this point of view. If you want lazy loading - use custom models.

From this page :
You can write your own class that extends AbstractListModel or AbstractTableModel so that you can provide the needed data when necessary. The following example shows the usage of AbstractTableModel.

Answer 3

I have a JList, wich must display more than 3000 items.

Huh. You make that sound like a big number. Here is a list holding (and displaying just fine), more than 30 thousand items.

import javax.swing.*;

class BigList {

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                int bigNumber = 30001;
                String[] bigData = new String[bigNumber];
                for (int ii=0; ii<bigNumber; ii++) {
                    bigData[ii] = "String " + (ii+1);
                }
                JList list = new JList(bigData);
                list.setVisibleRowCount(5);

                JOptionPane.showMessageDialog(null, new JScrollPane(list));
            }
        });
    }
}