Question: 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

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. Hint: Call in.useDelimiter("[^A-Za-z0-9_]+"). Then each call to next returns a string consisting only of letters, numbers, and underscores.

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