What this is

This file is part of the Tame Swing collection that we have compiled. All of the Java source code in these examples was created by Nobuo Tamemasa. As these examples have become hard to find on the internet, we have put them in one place here, supported by minimal advertising. In time we will include images of each running sample Java/Swing application.

The intent of having these files here is to help you learn Java and Swing by example, and Tame certainly created some terrific examples of the power of the Swing framework.

Other links

Keywords/tags

java, swing, example, sample, source, custom, table, JTable, column, fix, fixed, position, header, cell, row

The source code

/* (swing1.1beta3) */
package tame.examples;

import java.awt.BorderLayout;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JViewport;
import javax.swing.ListSelectionModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.table.AbstractTableModel;

/**  Thows an NPE
<pre>
Exception in thread "main" java.lang.NullPointerException
        at tame.examples.FixedColumnExample.access$000(FixedColumnExample.java:21)
</pre>
@version 1.0 12/05/98
@author Nobuo Tamemasa
*/
public class FixedColumnExample extends JFrame {
  Object[][] data;
  Object[] column;
  JTable fixedTable,table;

  public FixedColumnExample() {
    super( "Fixed Column Example" );
    setSize( 400, 150 );

    data =  new Object[][]{
        {"1","11","A","","","","",""},
        {"2","22","","B","","","",""},
        {"3","33","","","C","","",""},
        {"4","44","","","","D","",""},
        {"5","55","","","","","E",""},
        {"6","66","","","","","","F"}};
    column = new Object[]{"fixed 1","fixed 2","a","b","c","d","e","f"};

    AbstractTableModel fixedModel = new AbstractTableModel() {
      public int getColumnCount() { return 2; }
      public int getRowCount() { return data.length; }
      public String getColumnName(int col) {
       return (String)column[col];
      }
      public Object getValueAt(int row, int col) {
        return data[row][col];
      }
    };
    AbstractTableModel    model = new AbstractTableModel() {
      public int getColumnCount() { return column.length -2; }
      public int getRowCount() { return data.length; }
      public String getColumnName(int col) {
       return (String)column[col +2];
      }
      public Object getValueAt(int row, int col) {
        return data[row][col+2];
      }
      public void setValueAt(Object obj, int row, int col) {
        data[row][col +2] = obj;
      }
      public boolean CellEditable(int row, int col) {
        return true;
      }
    };

    fixedTable = new JTable( fixedModel ) {
      public void valueChanged(ListSelectionEvent e) {
        super.valueChanged(e);
        checkSelection(true);
      }
    };
    table = new JTable( model ) {
      public void valueChanged(ListSelectionEvent e) {
        super.valueChanged(e);
        checkSelection(false);
      }
    };
    fixedTable.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
    table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
    fixedTable.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
    table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);

    JScrollPane scroll = new JScrollPane( table );
    JViewport viewport = new JViewport();
    viewport.setView(fixedTable);
    viewport.setPreferredSize(fixedTable.getPreferredSize());
    scroll.setRowHeaderView(viewport);
    scroll.setCorner(JScrollPane.UPPER_LEFT_CORNER,fixedTable.getTableHeader());

    getContentPane().add(scroll, BorderLayout.CENTER);
  }

  private void checkSelection(boolean isFixedTable) {
    int fixedSelectedIndex = fixedTable.getSelectedRow();
    int      selectedIndex = table.getSelectedRow();
    if (fixedSelectedIndex != selectedIndex) {
      if (isFixedTable) {
        table.setRowSelectionInterval(fixedSelectedIndex,fixedSelectedIndex);
      } else {
        fixedTable.setRowSelectionInterval(selectedIndex,selectedIndex);
      }
    }
  }

  public static void main(String[] args) {
    FixedColumnExample frame = new FixedColumnExample();
    frame.addWindowListener( new WindowAdapter() {
      public void windowClosing( WindowEvent e ) {
	System.exit(0);
      }
    });
    frame.setVisible(true);
  }
}