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A Java identifier is a name consisting of letters and digits, the
first of which must be a letter. The underscore,
_, and the dollar
sign, $, count as letters.
Most Java programmers do not use the underscore when they run words
together to produce long identifiers. Instead, they initiate the first
word with a lowercase character and each interior word with an uppercase
character, as in movieRating. You should adhere to this
convention; otherwise, other programmers will find your programs
difficult to understand.