(a) Applet at the beginning(b) Applet after using vertical scroll bar
Figure 16.26 Output screen of Program 16.24
Explanation:In the init() a vertical scroll bar is created by the name SB . The minimum and maximum
values for this scroll bar are 5 and 500, respectively, and unit increment is 5. In the adjustment
ValueChanged method, the type of events occurring onto the scroll bar are recognized. For UNIT_
INCREMENT and UNIT_DECREMENT events the value of Y was incremented/decremented by 5. For
the BLOCK_INCREMENTand BLOCK_DECREMENT event, the value of Ywas incremented/decremented
by
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