Oracle 1Z0-816 Online Practice Questions and Exam Preparation

Oracle 1Z0-816 Online Questions & Answers

• Question 1:

  Given: Which annotation should be used to remove warnings from compilation?

  

  A. @SuppressWarnings on the main and print methods
  B. @SuppressWarnings("unchecked") on main and @SafeVarargs on the print method
  C. @SuppressWarnings("rawtypes") on main and @SafeVarargs on the print method
  D. @SuppressWarnings("all") on the main and print methods
  B. @SuppressWarnings("unchecked") on main and @SafeVarargs on the print method

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  explanation:

  

• Question 2:

  Given:

  jdeps -jdkinternals C:\workspace4\SimpleSecurity\jar\classes.jar

  Which describes the expected output?

  A. jdeps lists the module dependencies and the package names of all referenced JDK internal APIs. If any are found, the suggested replacements are output in the console.
  B. jdeps outputs an error message that the -jdkinternals option requires either the -summary or the -verbose options to output to the console.
  C. The -jdkinternals option analyzes all classes in the .jar and prints all class-level dependencies.
  D. The -jdkinternals option analyzes all classes in the .jar for class-level dependencies on JDK internal APIs. If any are found, the results with suggested replacements are output in the console.
  A. jdeps lists the module dependencies and the package names of all referenced JDK internal APIs. If any are found, the suggested replacements are output in the console.

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  explanation:

  -jdkinternals option analyzes all classes in the .jar for class-level dependencies on JDK internal APIs. If any are found, the results with suggested replacements are output in the console.

• Question 3:

  Given:

  List longlist = List.of("Hello","World","Beat"); List shortlist = new ArrayList<>();

  Which code fragment correctly forms a short list of words containing the letter "e"?

  

  A. Option A
  B. Option B
  C. Option C
  D. Option D
  C. Option C

• Question 4:

  Given the code fragment:

  Path source = Paths.get("/repo/a/a.txt"); Path destination = Paths.get("/repo"); Files.move(source, destination); // line 1 Files.delete (source); // line 2

  Assuming the source file and destination folder exist, what Is the result?

  A. A java.nio.file.FileAlreadyExistsException is thrown on line 1.
  B. A java.nio.file.NoSuchFileException is thrown on line 2.
  C. A copy of /repo/a/a.txt is moved to the /repo directory and /repo/a/a.txt is deleted.
  D. a.txt is renamed repo.
  C. A copy of /repo/a/a.txt is moved to the /repo directory and /repo/a/a.txt is deleted.

• Question 5:

  Given this enum declaration:

  

  Examine this code:

  System.out.println(Letter.values()[1]);

  What code should be written at line 5 for this code to print 200?

  A. public String toString() { return String.valueOf(ALPHA.v); }
  B. public String toString() { return String.valueOf(Letter.values()[1]); }
  C. public String toString() { return String.valueOf(v); }
  D. String toString() { return "200"; }
  C. public String toString() { return String.valueOf(v); }

• Question 6:

  Which two statements independently compile? (Choose two.)

  A. List
  B. List
  C. List
  D. List
  E. List
  A. List
  C. List

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  explanation:

  

• Question 7:

  Given:

  LocalDate d1 = LocalDate.of(1997,2,7); DateTimeFormatter dtf = DateTimeFormatter.ofPattern( /*insert code here*/ ); System.out.println(dtf.format (d1));

  Which pattern formats the date as Friday 7th of February 1997?

  A. "eeee dd+"th of"+ MMM yyyy"
  B. "eeee dd'th of' MMM yyyy"
  C. "eeee d+"th of"+ MMMM yyyy"
  D. "eeee d'th of' MMMM yyyy"
  B. "eeee dd'th of' MMM yyyy"

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  explanation:

  Reference: https://books.google.com.pk/books?id=PmiO65T9hF0Candpg=PA385andlpg=PA385anddq=java+pattern+formats+eeee+d%2Bth+of%2B+MMMM+yyyyandsource=blandots=IJN_AnWQjandsig=ACfU3U2RJf7iuK3t_SKARwLSaak9xxV09Aandhl=enandsa=Xandved=2ahUKEwi4m6LL3vLoAhVgTRUIHURpC38Q6AEwDHoECBQQAQ#v=onepageandq=java%20pattern%20formats%20eeee%20d%2Bth%20of%2B%20MMMM% 20yyyyandf=false

• Question 8:

  Given:

  

  and checkQuality(QUALITY.A); and

  

  Which code fragment can be inserted into the switch statement to print Best?

  A. QUALITY.A.ValueOf()
  B. A
  C. A.toString()
  D. QUALITY.A
  B. A

• Question 9:

  Which interface in the java.util.function package can return a primitive type?

  A. ToDoubleFunction
  B. Supplier
  C. BiFunction
  D. LongConsumer
  A. ToDoubleFunction

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  explanation:

  Reference: http://java.boot.by/ocpjp8-upgrade-guide/ch02s07.html

• Question 10:

  Given:

  

  What is the result?

  A. Orange Juice
  B. The compilation fails.
  C. Orange Juice Apple Pie Lemmon Ice Raspberry Tart
  D. The program prints nothing.
  C. Orange Juice Apple Pie Lemmon Ice Raspberry Tart

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  explanation: