fix the first column

hello everyone
how I can fix the column first knowing that I use netbeans.

thank you

What do you mean with "the first column"? And what is "fix"? Please TellTheDetails.

is what I can make my first column of my JTable fixed as Excel

Ah, you mean the "freeze panes" option.

For those of us who don't know Excel that well, this option allows the user to have the top X columns (X is configurable) remain fixed. Scrolling will be limited to the remaining columns. The same can be applied to the left X rows as well. If both a number of rows and a number of columns are frozen the bottom-right part contains the scrolling.

I can think of one technique to do this:
- create one JTable with the TableModel. Use a RowSorter with a RowFilter to filter out all rows with a row number >= X. This will be the table part with the header and the first X rows.

- create another JTable with the same TableModel. Again, use a RowSorter with a RowFilter to filter out all rows with a row number < X. This will be the table part with everything but the header and the first X rows.

- add a TableColumnModelListener to the TableColumnModel of the top JTable; this listener will apply the same changes to the TableColumnModel of the bottom JTable. This will make sure that when you resize a column in the top JTable (the one with the header) the column will be resized equally in the bottom JTable.

- wrap the bottom JTable in a JScrollPane. This will automatically add the header of this JTable.

- set the column header of the JScrollPane to be a JPanel with the top JTable and its JTableHeader. I think this should do it:

I haven't tested this, but I think this should do it. You basically moved X rows from the JScrollPane's view port to its column header.

Edit: scratch step 3. Instead of using two TableColumnModels that are synchronized using listeners, just set the bottom JTable's TableColumnModel to that of the top JTable.

Here's that all written in code, using the sharing of the TableColumnModel:

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.table.*;

public class Test
{
    public static void main(String[] args) throws Exception
    {
        String[] header = new String[26];
        String[][] data = new String[100][26];
        for (char c = 'A'; c <= 'Z'; c++)
        {
            int index = c - 'A';
            header[index] = String.valueOf(c);
            for (int r = 0; r < 100; r++)
            {
                data[r][index] = String.format("%s%02d", header[index], Integer.valueOf(r));
            }
        }
        TableModel model = new DefaultTableModel(data, header);

// step 1
        JTable topTable = new JTable(model);
        RowFilter<TableModel,Integer> topFilter = new RowFilter<TableModel,Integer>()
        {
            public boolean include(RowFilter.Entry<? extends TableModel,? extends java.lang.Integer> entry)
            {
                return entry.getIdentifier().intValue() < 1;
            }
        };
        TableRowSorter<TableModel> topSorter = new TableRowSorter<TableModel>(model)
        {
            @Override
            public boolean isSortable(int column)
            {
                return false; // disable sorting
            }
        };
        topSorter.setRowFilter(topFilter);
        topTable.setRowSorter(topSorter);

// step 2
        JTable bottomTable = new JTable(model);
        RowFilter<TableModel,Integer> bottomFilter = new RowFilter<TableModel,Integer>()
        {
            public boolean include(RowFilter.Entry<? extends TableModel,? extends java.lang.Integer> entry)
            {
                return entry.getIdentifier().intValue() >= 1;
            }
        };
        TableRowSorter<TableModel> bottomSorter = new TableRowSorter<TableModel>(model)
        {
            @Override
            public boolean isSortable(int column)
            {
                return false; // disable sorting
            }
        };
        bottomSorter.setRowFilter(bottomFilter);
        bottomTable.setRowSorter(bottomSorter);

// step 3
        bottomTable.setColumnModel(topTable.getColumnModel());

// step 4
        JScrollPane scrollPane = new JScrollPane(bottomTable);

// step 5
        JPanel panel = new JPanel(new BorderLayout());
        panel.add(topTable.getTableHeader(), BorderLayout.NORTH);
        panel.add(topTable, BorderLayout.CENTER);
        scrollPane.setColumnHeaderView(panel);

JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.add(scrollPane);

frame.add(new JScrollPane(topTable), BorderLayout.NORTH);
        frame.pack();
        // maximize
        frame.setExtendedState(frame.getExtendedState() | Frame.MAXIMIZED_BOTH);
        frame.setVisible(true);
    }
}

This has two problems:
1) the JScrollPane's column header will be reset by the JScrollPane automatically to the JTableHeader of the second table.

2) the resizing of columns is now somehow broken; dragging works as expected.

I'm sure one of our Swing guru's (Rob C, Darryl B, Pete S, Michael D) can help fix these issues.

Thank you

my attempt (limited testing, so probably very brittle)

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.table.*;

class Testing
{
  public void buildGUI()
  {
    DefaultTableModel dtm = new DefaultTableModel();
    dtm.setColumnCount(26);
    dtm.setRowCount(100);
    for(int x = 0, y = dtm.getColumnCount(); x < y ; x++)
    {
      for(int xx = 0, yy = dtm.getRowCount(); xx < yy ; xx++)
      {
        dtm.setValueAt(new Integer((int)(Math.random()*10000)),xx,x);
      }
    }

JTable table = new JTable(dtm);
    table.setAutoCreateRowSorter(true);
    table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
    table.removeColumn(table.getColumnModel().getColumn(0));
    JScrollPane sp = new JScrollPane(table,ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);

JTable tableLeft = new JTable(dtm);
    tableLeft.setRowSorter(table.getRowSorter());
    tableLeft.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
    for(int x = tableLeft.getColumnCount()-1; x > 0 ; x--) tableLeft.removeColumn(tableLeft.getColumnModel().getColumn(x));

JScrollPane spLeft = new JScrollPane(tableLeft,ScrollPaneConstants.VERTICAL_SCROLLBAR_NEVER,ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
    Dimension dim = spLeft.getPreferredSize();
    spLeft.setPreferredSize(new Dimension(tableLeft.getColumnModel().getColumn(0).getWidth(),dim.height));

sp.getVerticalScrollBar().setModel(spLeft.getVerticalScrollBar().getModel());

JPanel p = new JPanel(new BorderLayout());
    p.add(sp);
    p.add(spLeft,BorderLayout.WEST);

JScrollBar sb = new JScrollBar(SwingConstants.HORIZONTAL);
    sb.setModel(sp.getHorizontalScrollBar().getModel());

JFrame f = new JFrame();
    f.getContentPane().add(p);
    f.getContentPane().add(sb,BorderLayout.SOUTH);
    f.pack();
    f.setLocationRelativeTo(null);
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.setVisible(true);
    RowAlignmentListener ral = new RowAlignmentListener(table,tableLeft);
    table.addMouseListener(ral);
    tableLeft.addMouseListener(ral);
  }
  public static void main(String[] args)
  {
    SwingUtilities.invokeLater(new Runnable(){
      public void run(){
        new Testing().buildGUI();
      }
    });
  }
}
class RowAlignmentListener extends MouseAdapter
{
  JTable table1,table2;
  public RowAlignmentListener(JTable t1,JTable t2)
  {
    table1 = t1; table2 = t2;
  }
  public void mousePressed(MouseEvent me)
  {
    JTable table = (JTable)me.getSource();
    int selectedRow = table.getSelectedRow();
    table1.changeSelection(selectedRow,table.getSelectedColumn(),false,false);
    table2.changeSelection(selectedRow,0,false,false);
  }
}

That code works for freezing the left X columns. Now do the same for freezing the top X rows

The problem with that is the table header. You'll need to show only one (or two, if you also freeze the left X columns), but the resizing / reordering will need to work on the bottom table(s) as well. Still, by not using JScrollPane's column header, row header and other non-viewport components the solution may solve the problems I had with my code.

the resizing of columns is now somehow broken

Yes, in the past I've tried to share the TableColumnModel between multple tables (when I was trying to create a "footer" row) and have had the same problems so I don't have anything new to offer.

I also originally read the question the same way Michael did, but since the OP accepted your response I didn't bother posting my standard solution which is to check out the Fixed Column Table

my attempt (limited testing, so probably very brittle)

One problem is using the keyboard for navigation. The row selection isn't in sync. My solution above shares the ListSelectionModel, which works for both mouse and keyboard navigation/selection.