e746. adding an icon to a jbutton component.txt

这里面包含了一百多个JAVA源文件

If the action used to create the button contains an icon, the button will be created using that icon. The icon will appear to the left of the text; to change the icon's position, see e747 Moving the Icon in a JButton Component. 
    // Retrieve the icon
    Icon icon = new ImageIcon("icon.gif");
    
    // Create an action with an icon
    Action action = new AbstractAction("Button Label", icon) {
        // This method is called when the button is pressed
        public void actionPerformed(ActionEvent evt) {
            // Perform action
        }
    };
    
    // Create the button; the icon will appear to the left of the label
    JButton button = new JButton(action);

If the action does not have an icon or a different icon must be used, add or change the icon using setIcon(): 
    // Add or change the icon; it will appear to the left of the text
    button.setIcon(icon);
    
    // Set to null to remove icon
    button.setIcon(null);