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BJP5 Self-Check 5.15: isVowel

Language/Type: Java method basics return String
Author: Marty Stepp (on 2019/09/19)

Write a method named isVowel that returns whether a String is a vowel (a single-letter string containing a, e, i, o, or u, case-insensitively).

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This is a method problem. Write a Java method as described. Do not write a complete program or class; just the method(s) above.

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