Question: write a program that reads a file name from a dialog box. You should expect that the file name has one. (dot) character in it,

write a program that reads a file name from a dialog box. You should expect that the file name has one. (dot) character in it, separating the file name from the file extension. Retrieve the file extension and output it. For instance if the user inputs index.html, you should output html; if the user inputs MyClass.java, your should output java.

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