Swing II - Java - page 974

Icons and the Class ImageIcon
An icon is simply a small picture, although it is not really required to be small. The class
ImageIcon is used to convert a picture file to a Swing icon.
SYNTAX
ImageIcon Name_Of_ImageIcon =
new ImageIcon( Picture_File_Name );
The Picture_File_Name is a string giving either a relative or absolute path name to the picture
file. (So if the picture file is in the same directory as your program, you need give only the name
of the picture file.)
EXAMPLE
ImageIcon happyIcon =
new ImageIcon("smiley.gif");
argument; also, the constructor for a JLabel requires a third argument, as described in
Display 18.5. If you omit either text or an icon (or both) from the constructor, you
can add them later with the methods setText and setIcon . Some of these methods
for the classes JButton , JMenuItem , and Jlabel are given in Display 18.5.
Display 18.5 Some Methods in the Classes JButton , JMenuItem , and JLabel (part 1 of 2)
public JButton()
public JMenuItem()
public JLabel()
Creates a button, menu item, or label with no text or icon on it. (Typically, you will later use setText
and/or setIcon with the button, menu item, or label.)
public JButton(String text)
public JMenuItem(String text)
public JLabel(String text)
Creates a button, menu item, or label with the text on it.
public JButton(ImageIcon picture)
public JMenuItem(ImageIcon picture)
public JLabel(ImageIcon picture)
Creates a button, menu item, or label with the icon picture on it and no text.