Baking a Pie Graph
To draw this hour to a close, you create
PiePanel, a GUI component that displays a pie graph. This component is a subclass of
JPanel, a simple Swing container that’s useful as a place to draw something.
One way to begin creating a class is to define the way objects of the class are created. Programs that use the
PiePanel class must undertake the following steps:
• Create a
PiePanel object by using the constructor method
). The integer specified as an argument is the number of slices the pie graph contains.
• Call the object’s
) method to give a slice the designated color and value.
The value of each slice in
PiePanel is the quantity represented by that slice.
For example, Table 23.1 displays ...