《Java2图形设计卷II：Swing》配套光盘源码

				import java.awt.*;
				import java.awt.event.*;
				import javax.swing.*;
				import javax.swing.border.*;
				
				public class Test extends JApplet {
					private JComboBox charsCombo = new JComboBox(new Object[] {
							new Character('g'), new Character('o'), 
							new Character('r'), new Character('b'), 
							new Character('y'), new Character('m'), 
							new Character('g'), new Character('l'),
					});
					private JComboBox colorCombo = new JComboBox(new Object[] {
							new Item(new Object[] { Color.gray, "gray" }),
							new Item(new Object[] { Color.orange, "orange" }),
							new Item(new Object[] { Color.red, "red" }),
							new Item(new Object[] { Color.blue, "blue" }),
							new Item(new Object[] { Color.yellow, "yellow" }),
							new Item(new Object[] { Color.magenta, "magenta" }),
							new Item(new Object[] { Color.black, "black" }),
							new Item(new Object[] { Color.green, "green" }),
							new Item(new Object[] { Color.lightGray, "lightGray"})
					});
				
					public void init() {
						final Container contentPane = getContentPane();
				
						colorCombo.setRenderer(new ColorRenderer());
				
						colorCombo.addActionListener(new ActionListener(){
							public void actionPerformed(ActionEvent e) {
								Item item = (Item)colorCombo.getSelectedItem();
								Character first = new Character(
													  item.toString().charAt(0));
				
								showStatus("'" + first.toString() + "'" +
										   " is for " + item);
							}
						});
						charsCombo.addActionListener(new ActionListener() {
							public void actionPerformed(ActionEvent e) {
								final Character c = (Character)
													 charsCombo.getSelectedItem();
				
								colorCombo.selectWithKeyChar(c.charValue());
				
								SwingUtilities.invokeLater(new Runnable() {
									public void run() {
										Item item = (Item)
													colorCombo.getSelectedItem();
				
										JOptionPane.showMessageDialog(contentPane,
											"'" + c.toString() + "'" +
											" is for " + item.toString());
									}
								});
							}
						});
						contentPane.setLayout(
									new FlowLayout(FlowLayout.CENTER, 10, 35));
				
						contentPane.add(new JLabel("Select a Character:"));
						contentPane.add(charsCombo);
						contentPane.add(colorCombo);
					}
				}
				class Item {
					private Color color;
					private String string;
				
					public Item(Object[] array) {
						color = (Color)array[0];
						string = (String)array[1];
					}
					public Color getColor() { return color; }
					public String toString() { return string; }
				}
				
				class ColorRenderer extends JLabel implements ListCellRenderer {
					private static ColorIcon icon = new ColorIcon();
				
					private Border 
						redBorder = BorderFactory.createLineBorder(Color.red,2),
						emptyBorder = BorderFactory.createEmptyBorder(2,2,2,2);
				
					public Component getListCellRendererComponent(
													JList list,
													Object value,
													int index,
													boolean isSelected,
													boolean cellHasFocus) {
						Item item = (Item)value;
				
						icon.setColor(item.getColor());
				
						setIcon(icon);
						setText(item.toString());
				
						if(isSelected) setBorder(redBorder);
						else 		   setBorder(emptyBorder);
				
						return this;
					}
				}
				class ColorIcon implements Icon {
					private Color color;
					private int w, h;
				
					public ColorIcon() {
						this(Color.gray, 50, 15);
					}
					public ColorIcon(Color color, int w, int h) {
						this.color = color;
						this.w = w;
						this.h = h;
					}
					public void paintIcon(Component c, Graphics g, int x, int y) {
						g.setColor(Color.black);
						g.drawRect(x, y, w-1, h-1);
						g.setColor(color);
						g.fillRect(x+1, y+1, w-2, h-2);
					}
					public Color getColor() {
						return color;
					}
					public void setColor(Color color) {
						this.color = color;
					}
					public int getIconWidth() {
						return w;
					}
					public int getIconHeight() {
						return h;
					}
				}