February 2014
Beginner
1248 pages
62h 25m
English
Content preview from Java™ How To Program (Early Objects), Tenth Edition
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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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