Understanding Abstract Classes and Interfaces - Java Programming: Comprehensive Concepts and Techniques - page 653

Activator object
reference

User object
reference

Activator object
reference

StockFrame
constructor

FIGURE 10-43

3. Enter lines 61 through 112 as shown in Figure 10-41 on page 649.
TextPad displays code for the centerOnScreen() method (Figure 10-44).
The constructor calls this method to size and center the display on the
user screen.

centerOnScreen()
method

FIGURE 10-44

(continued)