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askFileName

Language/Type: Java file input
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Write a method named askFileName that repeatedly prompts the user for a file name until the user types the name of a file that exists on the system. Once you get a good file name, return that file name as a String. Here is a sample dialogue from one call to your method, assuming that the file good.txt does exist and the others do not: 

Type a file name: bad.txt
Type a file name: not_here.txt
Type a file name: good.txt
Method: Write a Java method as described, not a complete program or class.

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