GUI and Graphics Case Study Exercise
3.1 Modify the addition program in Fig. 2.7 to use dialog-based input and output with the methods of class JOptionPane
. Since method showInputDialog
returns a String
, you must convert the String
the user enters to an int
for use in calculations. The static
method parseInt
of class Integer
(package java.lang
) takes a String
argument representing an integer and returns the value as an int
. If the String
does not contain a valid integer, the program will terminate with an error.
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