Decision Making and Repetition with Reusable Objects - Java Programming: Comprehensive Concepts and Techniques - page 222

CommissionApplet
window

text box for
input of sales
amount

graphic

input prompts

option buttons
for input of
commission
code

formatted
output

FIGURE 4-3b

PROGRAM DESIGN Once you have designed the interface, the next step is to
design the logic to solve the problem and create the desired results. Figure 4-4
shows the flowchart and related pseudocode that represents the logic of the
program. Each process symbol references the pseudocode for each of the five
methods required in this program. The main() method calls each of these five
methods after the program starts.

Display prompt to user
Test for Cancel button
If yes

Start

call Finish Procedure
Test for sales amount <= 0
If yes

display error message
repeat process

Get Sales

Else

return sales amount

Get Code

Display prompt to user
Test for invalid code
If yes

display error message
repeat process

Else

return code

Get Commission

If code = 1
commission = sales * .10
If code = 2
commission = sales * .14
If code = 3
commission = sales * .18
Return commission

Perform Output

Finish

Display formatted sales and commission

Exit all dialog boxes

End

FIGURE 4-4