Question: Write an original Java class with three methods that each take a string and return an int. One method counts the digits, one counts the

Write an original Java class with three methods that each take a string and return an int. One method counts the digits, one counts the letters (upper and lower case), and one counts everything else (spaces, punctuation, etc.). No methods cause I/O. Include complete JavaDoc. Add a JUnit class to test each method using the 12-character string, "Hello world!"

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