Oracle Java SE 1Z0-819 Questions & Answers

• Question 1:

  Given:

  

  What is the result?

  A. compilation error

  B. 0 5

  C. 6 13

  D. 5 12

  Correct Answer: A

  

• Question 2:

  Given:

  

  What is the output?

  A. null

  B. A NoSuchElementException is thrown at run time.

  C. Duke

  D. A NullPointerException is thrown at run time.

  Correct Answer: C

  

• Question 3:

  Given:

  

  What code must you insert on Line 1 to enable the code to print Hello world?

  A. Hello.Greeting myG = new Hello.Greeting() myG.sayHi();

  B. Hello myH = new Hello(); Hello.Greeting myG = myH.new Greeting(); myG.sayHi();

  C. Hello myH = new Hello(); Hello.Greeting myG = myH.new Hello.Greeting(); myG.sayHi();

  D. Hello myH = new Hello(); Greeting myG = new Greeting(); myG.sayHi ();

  Correct Answer: B

• Question 4:

  Given this enum declaration:

  

  Examine this code:

  System.out.println(Alphabet.getFirstLetter());

  What code should be written at line 3 to make this code print A?

  A. final String getFirstLetter() { return A.toString(); }

  B. static String getFirstLetter() { return Alphabet.values()[1].toString(); }

  C. static String getFirstLetter() { return A.toString(); }

  D. String getFirstLetter() { return A.toString(); }

  Correct Answer: C

• Question 5:

  Your organization provides a cloud server to your customer to run their Java code. You are reviewing the changes for the next release and you see this change in one of the config files:

  

  Which is correct?

  A. You accept the change because -noverify is necessary for your code to run with the latest version of Java.

  B. You reject the change because -Xms8g -Xmx8g uses too much system memory.

  C. You accept the change because -noverify is a standard option that has been supported since Java 1.0.

  D. You reject the change because -noverify is a critical security risk.

  Correct Answer: D

• Question 6:

  Given:

  

  What is the result?

  A. 3 5 3 3

  B. 3 3 3 3

  C. 3 5 3 5

  D. 5 5 3 3

  Correct Answer: A

  

• Question 7:

  Given the content from the course.txt file:

  

  Given the code fragment:

  

  Which code fragment at line 1 prints the lines that contain Java from the course.txt file?

  

  A. Option A

  B. Option B

  C. Option C

  D. Option D

  E. Option E

  Correct Answer: E

• Question 8:

  Which two statements correctly describe capabilities of interfaces and abstract classes? (Choose two.)

  A. Interfaces cannot have protected methods but abstract classes can.

  B. Both interfaces and abstract classes can have final methods.

  C. Interfaces cannot have instance fields but abstract classes can.

  D. Interfaces cannot have static methods but abstract classes can.

  E. Interfaces cannot have methods with bodies but abstract classes can.

  Correct Answer: AC

  Reference: https://www.guru99.com/interface-vs-abstract-class-java.html

• Question 9:

  Given:

  

  What is the output?

  A. :APPLE:ORANGE:BANANA appleorangebanana

  B. :APPLE:ORANGE:BANANA

  C. APPLE:apple ORANGE:orange BANANA:banana

  D. appleorangebanana :APPLE:ORANGE:BANANA

  E. apple:APPLE orange:ORANGE banana:BANANA

  Correct Answer: E

• Question 10:

  

  Given:

  String originalPath = "data\\projects\\a-project\\..\\..\\another-project";

  Path path = Paths.get(originalPath);

  System.out.print(path.normalize());

  What is the result?

  A. data\another-project

  B. data\projects\a-project\another-project

  C. data\\projects\\a-project\\..\\..\\another-project

  D. data\projects\a-project\..\..\another-project

  Correct Answer: D