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				Displaying an Icon in a Column Head of a JTable Component
				(Java Developers Almanac Example)
				
				
				
				
				
				
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				The Java Developers Almanac 1.4
				
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				    javax.swing.table
				         [62 examples]
				        
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				        Column Heads
				             [6 examples]
				            
				
				  
				    e932.  
				    Displaying an Icon in a Column Head of a JTable Component
				
				Although the default renderer for a table header is a JLabel, the
				default renderer will only display text.  This example demonstrates
				how to install a custom renderer that can display text as well as
				icons.
				
				
				
				    DefaultTableModel model = new DefaultTableModel();
				    JTable table = new JTable(model);
				    
				    // Create 2 columns
				    model.addColumn("Col1");
				    model.addColumn("Col2");
				    // the header value for this column will be overwritten
				    // with a TextandIcon object
				    
				    // Set the icon renderer on the second column
				    table.getTableHeader().getColumnModel()
				        .getColumn(1).setHeaderRenderer(iconHeaderRenderer);
				    
				    // Set the text and icon values on the second column for the icon render
				    table.getColumnModel().getColumn(1).setHeaderValue(
				        new TextAndIcon("Col2", new ImageIcon("icon.gif")));
				    
				    // This class is used to hold the text and icon values
				    // used by the renderer that renders both text and icons
				    class TextAndIcon {
				        TextAndIcon(String text, Icon icon) {
				            this.text = text;
				            this.icon = icon;
				        }
				        String text;
				        Icon icon;
				    }
				    
				    // This customized renderer can render objects of the type TextandIcon
				    TableCellRenderer iconHeaderRenderer = new DefaultTableCellRenderer() {
				        public Component getTableCellRendererComponent(JTable table, Object value,
				                boolean isSelected, boolean hasFocus, int row, int column) {
				            // Inherit the colors and font from the header component
				            if (table != null) {
				                JTableHeader header = table.getTableHeader();
				                if (header != null) {
				                    setForeground(header.getForeground());
				                    setBackground(header.getBackground());
				                    setFont(header.getFont());
				                }
				            }
				    
				            if (value instanceof TextAndIcon) {
				                setIcon(((TextAndIcon)value).icon);
				                setText(((TextAndIcon)value).text);
				            } else {
				                setText((value == null) ? "" : value.toString());
				                setIcon(null);
				            }
				            setBorder(UIManager.getBorder("TableHeader.cellBorder"));
				            setHorizontalAlignment(JLabel.CENTER);
				            return this;
				        }
				    };
				
				
				
				
				             Related Examples
				        
				
				
				
				
				e930. 
				    Showing the Table Header in a Non-Scrollable JTable Component
				
				
				
				e931. 
				    Changing the Name of a Column in a JTable Component
				
				
				
				e933. 
				    Implementing Variable-Height Column Headers in a JTable Component
				
				
				
				e934. 
				    Removing the Column Headers from a Scrollable in a JTable Component
				
				
				
				e935. 
				    Creating a Custom Column Header Renderer in a JTable Component
				
				
				
				
				
				
				
				
				        See also: 
				
				    Cells
				  
				
				
				    Columns
				  
				
				
				    Editing
				  
				
				
				    Events
				  
				
				
				    Layout
				  
				
				
				    Rows
				  
				
				
				    Scrolling
				  
				
				
				    Selection
				  
				
				
				    Sorting
				  
				
				
				    Table Model
				  
				
				
				    Tool Tips
				  
				
				
				
				
				
				
				
				
				
				© 2002 Addison-Wesley.