Result of Exam 1Z0-809: Java SE 8 Programmer II

What is the result?

Question

The data.doc, data.txt and data.xml files are accessible and contain text.

Given the code fragment: Stream<Path> paths = Stream.of (Paths.

get("data.doc"), Paths.

get("data.txt"), Paths.

get("data.xml")); paths.filter(s-> s.toString().contains("data")).forEach( s -> { try { Files.readAllLines(s) .stream() .forEach(System.out::println); //line n1 } catch (IOException e) { System.out.println("Exception"); } } ); What is the result?

Answers

Explanations

Click on the arrows to vote for the correct answer

A. B. C. D.

A.

The given code reads the contents of the files whose names contain the string "data" from the current directory, and prints them to the console. Let's go through the code step by step to see how it works.

java
Stream<Path> paths = Stream.of(Paths.get("data.doc"), Paths.get("data.txt"), Paths.get("data.xml"));

This line creates a Stream<Path> object with three paths - "data.doc", "data.txt", and "data.xml". These paths are obtained using the Paths.get() method, which creates a Path object representing the file or directory at the given path.

java
paths.filter(s -> s.toString().contains("data")).forEach(s -> { try { Files.readAllLines(s).stream().forEach(System.out::println); //line n1 } catch (IOException e) { System.out.println("Exception"); } });

This code applies a filter to the Stream<Path> object to keep only the paths that contain the string "data" in their name. Then, for each remaining path, it attempts to read all lines from the file using the Files.readAllLines() method. This method returns a List<String> containing all the lines of the file. We convert the List<String> to a Stream<String> using the stream() method, and then print each line to the console using the forEach() method and a method reference System.out::println.

If an IOException is caught during file reading, it prints the string "Exception" to the console.

Now let's examine the options:

Option A: The program prints the content of data.txt file.

This is not correct, as the program reads the contents of all three files whose names contain "data", not just data.txt.

Option B: The program prints: Exception <<The content of the data.txt file>> <<The content of the data.xml file>>

This option is also incorrect. If an exception occurs while reading any of the files, the program will only print "Exception" to the console, not the file contents.

Option C: A compilation error occurs at line n1.

This option is not correct. There is no syntax error in the code, and the Files.readAllLines() method can be called on a Path object to read the contents of a file.

Option D: The program prints the content of the three files.

This option is correct. The code reads the contents of all three files whose names contain "data", not just data.txt. The program will print the contents of each file, separated by line breaks. If an exception occurs while reading any of the files, the program will only print "Exception" to the console, not the file contents.

Therefore, the correct answer is option D: The program prints the content of the three files.