Java SE 8 Programmer II - Exam 1Z0-809: Answer to "Which code fragment prints the contents of the customers.txt file?"

Code fragment to print contents of customers.txt

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Question

Assume customers.txt is accessible and contains multiple lines.

Which code fragment prints the contents of the customers.txt file?

Answers

A. Stream stream = Files.find (Paths.get ("customers.txt")); stream.forEach((String c) -> System.out.println(c));

B. Stream stream = Files.find (Paths.get ("customers.txt")); stream.forEach( c) -> System.out.println(c));

C. Stream stream = Files.list (Paths.get ("customers.txt")); stream.forEach( c) -> System.out.println(c));

D. Stream lines = Files.lines (Paths.get ("customers.txt")); lines.forEach( c) -> System.out.println(c));

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Explanations

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A. B. C. D.

The correct answer is D.

Option A uses the Files.find() method which is used to find files matching a certain criteria recursively in a directory hierarchy. This method returns a Stream<Path> which represents the paths of the matching files. However, this method cannot be used to read the contents of a file.

Option B also uses the Files.find() method and suffers from the same issue as option A.

Option C uses the Files.list() method which returns a Stream<Path> of all the entries in a directory. Since customers.txt is a file and not a directory, this method will not return any results.

Option D uses the Files.lines() method which returns a Stream<String> of the lines in a file. This method can be used to read the contents of a file line by line. The forEach() method is then called on the stream to print each line to the console.

Therefore, option D is the correct answer to print the contents of the customers.txt file.

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