列組

import java.util.*;

import java.awt.*;

import javax.swing.*;

import javax.swing.table.*;

/**

  * ColumnGroup

  */

public class ColumnGroup {

  protected TableCellRenderer renderer;

  protected Vector v;

  protected String text;

  protected int margin=0;

  public ColumnGroup(String text) {

    this(null,text);

  }

  public ColumnGroup(TableCellRenderer renderer,String text) {

    if (renderer == null)

     {

       this.renderer = new DefaultTableCellRenderer()

        {

    public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column)

     {

       JTableHeader header = table.getTableHeader();

       if (header != null)

          setForeground(header.getForeground());

          setBackground(header.getBackground());

          setFont(header.getFont());

        }

          setHorizontalAlignment(JLabel.CENTER);

          setText((value == null) ? "" : value.toString());

       setBorder(UIManager.getBorder("TableHeader.cellBorder"));

       return this;

     };

     }

    else

       this.renderer = renderer;

     }

    this.text = text;

    v = new Vector();

   public void add(Object obj) {

    if (obj == null) { return; }

    v.addElement(obj);

  /**

   * @param c    TableColumn

   * @param v    ColumnGroups

   */

  public Vector getColumnGroups(TableColumn c, Vector g) {

    g.addElement(this);

    if (v.contains(c)) return g;   

    Enumeration enum = v.elements();

    while (enum.hasMoreElements()) {

      Object obj = enum.nextElement();

      if (obj instanceof ColumnGroup) {

        Vector groups =

          (Vector)((ColumnGroup)obj).getColumnGroups(c,(Vector)g.clone());

        if (groups != null) return groups;

      }

    }

    return null;

  public TableCellRenderer getHeaderRenderer() {

    return renderer;

  public void setHeaderRenderer(TableCellRenderer renderer) {

    if (renderer != null) {

      this.renderer = renderer;

  public Object getHeaderValue() {

    return text;

  public Dimension getSize(JTable table) {

    Component comp = renderer.getTableCellRendererComponent(

        table, getHeaderValue(), false, false,-1, -1);

    int height = comp.getPreferredSize().height;

    int width  = 0;

      if (obj instanceof TableColumn) {

        TableColumn aColumn = (TableColumn)obj;

        width += aColumn.getWidth();

        width += margin;

      } else {

        width += ((ColumnGroup)obj).getSize(table).width;

    return new Dimension(width, height);

  public void setColumnMargin(int margin) {

    this.margin = margin;

        ((ColumnGroup)obj).setColumnMargin(margin);

}