e751. adding a rollover and pressed icon to a jbutton component.txt

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The rollover icon is displayed when the cursor is moved over the button. If no rollover icon is set, the default icon is displayed when the cursor is moved over the button. 
The pressed icon is displayed when the button is armed (i.e., the mouse button is down while the cursor is on the button). If no pressed icon is set, the default icon is displayed when the button is armed. 

The rollover and pressed icons are never displayed if the button is disabled. 

    // To create a button with an icon, see e746 Adding an Icon to a JButton Component
    
    // Add rollover icon
    Icon rolloverIcon = new ImageIcon("ricon.gif");
    button.setRolloverIcon(rolloverIcon);
    
    // Add pressed icon
    Icon pressedIcon = new ImageIcon("picon.gif");
    button.setPressedIcon(pressedIcon);
    
    // To remove rollover icon, set to null
    button.setRolloverIcon(null);
    
    // To remove pressed icon, set to null
    button.setPressedIcon(null);

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