Re: How do I Sort multi-colum in JTable?

On 11/10/2010 3:42 AM, Tu Tran Quoc wrote:


First have a look at SortKeys. Those are explained in the link you
posted, but just a bit further down the page.

This does allow you to sort by multiple columns. However, it seems to
only work once for the default sort. Once a user starts clicking on
columns, I don't see a way to re-establish the default sort.

Note in this example the 2nd table is sorted by the 2nd column first,
then by the 1st column.

package test;

import java.awt.Dimension;
import java.util.ArrayList;
import java.util.List;
import javax.swing.Box;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.RowSorter.SortKey;
import javax.swing.SortOrder;
import javax.swing.SwingUtilities;

/**
  *
  * @author Brenden
  */
public class TableSorter {

    public static void main( String[] args )
    {
       SwingUtilities.invokeLater( new Runnable() {
          public void run() {
             createAndShowGui();
          }
       } );
    }

    private static void createAndShowGui()
    {
       JFrame jf = new JFrame("Table Sorter");
       Box box = Box.createVerticalBox();

       JTable jt1 = makeNewJTable();
       jt1.setAutoCreateRowSorter( true );
       JScrollPane sc1 = new JScrollPane( jt1 );
       sc1.setPreferredSize( new Dimension( 400, 150 ) );
       box.add( sc1 );

       box.add( Box.createRigidArea( new Dimension( 20, 20 ) ) );

       JTable jt2 = makeNewJTable();
       jt2.setAutoCreateRowSorter( true );
       List<SortKey> sortKeys = new ArrayList<SortKey>();
       sortKeys.add( new SortKey( 1, SortOrder.ASCENDING ) );
       sortKeys.add( new SortKey( 0, SortOrder.ASCENDING ) );
       jt2.getRowSorter().setSortKeys( sortKeys );
       JScrollPane sc2 = new JScrollPane( jt2 );
       sc2.setPreferredSize( new Dimension( 400, 150 ) );
       box.add( sc2 );

       jf.add( box );
       jf.pack();
       jf.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
       jf.setLocationRelativeTo( null );
       jf.setVisible( true );

    }

    private static final Object[][] tableData =
    {
       { "Lisa", "Simpson", "Boxing", 2, true},
       { "Bart", "Simpson", "Checkers", 1, false},
       { "Joe", "Abbey", "Hockey", 10, false},
       { "Abigale", "Abbey", "Skating", 5, true },
    };
    private static final String[] columnNames =
     { "First Name", "Last Name", "Sport", "Years", "Vegitarian" };

    private static JTable makeNewJTable()
    {
       return new JTable( tableData, columnNames );
    }
}