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Write a program that reads a Java source file and produces an index of all identifiers
in the file. For each identifier, print all lines in which it occurs. For simplicity, we will
consider each string consisting only of letters, numbers, and underscores an identifier.
Use int = 1729
Declare a Scanner in for reading from the source file and call
in.useDelimiter("[^A-Za-z0-9_]+")
Then each call to next returns an identifier.
Expected output - 1, 7, 2, 9,
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