Given the code fragment:

What is the result?

• A.23
• B.12
• C.123
• D.13

Correct Answer: A

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Given:

It is required that if p instanceof Pair then p.isValid() returns true.
Which is the smallest set of visibility changes to insure this requirement is met?

• A.left, right, setLeft, and setRight must be private.
• B.left and right must be private.
• C.isValid must be public.
• D.setLeft and setRight must be protected.

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Given the code fragment:
Path currentFile = Paths.get("/scratch/exam/temp.txt");
Path outputFile = Paths get("/scratch/exam/new.txt");
Path directory = Paths.get("/scratch/");
Files.copy(currentFile, outputFile);
Files.copy(outputFile, directory);
Files.delete (outputFile);
The /scratch/exam/temp.txt file exists. The /scratch/exam/new.txt and /scratch/new.txt files do not exist.
What is the result?

• A./scratch/exam/new.txt and /scratch/new.txt are deleted.
• B.The program throws a FileaAlreadyExistsException.
• C.The program throws a NoSuchFileException.
• D.A copy of /scratch/exam/new.txt exists in the /scratch directory and /scratch/exam/new.txt is deleted.

Correct Answer: C

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Given:

What is the expected result of javac?

• A.javac compiles Mycar.java without errors or warnings.
• B.javac fails to compile the class and prints the error message, Error: Could not find or load main class Mycar.class
• C.javac fails to compile the class and prints the error message, C:\workspace4\Mycar.java:1:error: expected import java.lang
• D.javac fails to compile the class and prints the error message, C:\workspace4\Mycar.java:1:error: package java does not exist

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Why would you choose to use a peek operation instead of a forEach operation on a Stream?

• A.to remove an item from the end of the stream
• B.to process the current item and return void
• C.to remove an item from the beginning of the stream
• D.to process the current item and return a stream

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