Below is the beginning of an applet calculator. This
calculator can be used only for addition and
subtraction. You enter a number in each of the first
two fields and then click either "Add" or "Subtract".
You can continue to change the values in the first two
fields. Whenever you want the new sum or difference
computed, just click the appropriate button.
With the exception of this sentence, this is the
exact same html file and Java Applet code as shown
in Section 8.8 of Java by Dissection, second edition.
MiniCalcApplet