Ejemplo de un renderizador para alineación del texto, colores, frontera y fuente

.java

public class AlignTableCellRenderer extends DefaultTableCellRenderer.UIResource
{
  private DefaultTableCellRenderer renderizador;
  private int horizontalAlignment=SwingConstants.CENTER;
  private Color foregroundColor=null;
  private Color backgroundColor=null;
  private Border frontera=null;
  private int fontstyle=Font.PLAIN;
 
  public AlignTableCellRenderer(JTable table)
  {
    renderizador=(DefaultTableCellRenderer)table.getTableH eader().getDefaultRenderer();
  }

  public AlignTableCellRenderer(JTable table,int horizontalAlignment)
  {
    this(table);
    this.horizontalAlignment=horizontalAlignment;
  }

  public AlignTableCellRenderer(JTable table,int horizontalAlignment,Color foregroundColor)
  {
    this(table);
    this.horizontalAlignment=horizontalAlignment;
    this.foregroundColor=foregroundColor;
  }

  public AlignTableCellRenderer(JTable table,int horizontalAlignment,int fontstyle,Color foregroundColor)
  {
    this(table);
    this.horizontalAlignment=horizontalAlignment;
    this.foregroundColor=foregroundColor;
    this.fontstyle=fontstyle;
  }

  public AlignTableCellRenderer(JTable table,int horizontalAlignment,Border frontera)
  {
    this(table);
    this.horizontalAlignment=horizontalAlignment;
    this.frontera=frontera;
  }

  public AlignTableCellRenderer(JTable table,Border frontera)
  {
    this(table);
    this.frontera=frontera;
  }

  public void setForegroundColor(Color foregroundColor)
  {
    this.foregroundColor=foregroundColor;
  }

  public void setBackgroundColor(Color backgroundColor)
  {
    this.backgroundColor=backgroundColor;
  }

  public void setFontstyle(int fontstyle)
  {
    this.fontstyle=fontstyle;
  }

  @Override
  public Component getTableCellRendererComponent(JTable table,Object value,boolean isSelected,boolean hasFocus,int row,int column)
  {
    JLabel label=(JLabel)renderizador.getTableCellRendererCompone nt(table,value,isSelected,hasFocus,row,column);
    label.setHorizontalAlignment(horizontalAlignment);
    label.setFont(label.getFont().deriveFont(fontstyle ));

    if(foregroundColor!=null)
    {
      label.setForeground(foregroundColor);
    }
    if(backgroundColor!=null)
    {
      label.setBackground(backgroundColor);
    }
    if(frontera!=null)
    {
      label.setBorder(frontera);
    }

    return label;
  }

}