Oracle Java SE 1Z0-819 Questions & Answers

• Question 31:

  Given the content: What is the result?

  

  

  A. Option A

  B. Option B

  C. Option C

  D. Option D

  E. Option E

  Correct Answer: DE

• Question 32:

  Given:

  

  What is the result?

  A. 2,34,34,5

  B. 2,34,54,5

  C. 2,54,54,5

  D. 2,34,54,3

  Correct Answer: C

  

• Question 33:

  Which two are successful examples of autoboxing? (Choose two.)

  A. String a = "A";

  B. Integer e = 5;

  C. Float g = Float.valueOf(null);

  D. Double d = 4;

  E. Long c = 23L;

  F. Float f = 6.0;

  Correct Answer: AB

• Question 34:

  Given:

  

  Which three classes successfully override showFirst ()?

  

  A. Option A

  B. Option B

  C. Option C

  D. Option D

  E. Option E

  F. Option F

  Correct Answer: ABE

• Question 35:

  Which set of commands is necessary to create and run a custom runtime image from Java source files?

  A. java, jdeps

  B. javac, jlink

  C. jar, jlink

  D. javac, jar

  Correct Answer: B

  Reference: https://blogs.oracle.com/jtc/automating-the-creation-of-jdk9-reduced-runtime-images-in-netbeans

• Question 36:

  Given the code fragment:

  

  Which two statement inserted independently at line 1 enable this code to print PRRT?

  A. i--;

  B. continue b;

  C. break b;

  D. j--;

  E. continue a;

  F. break a ;

  Correct Answer: CE

• Question 37:

  Given:

  

  Which statement is true about the Fox class?

  A. Fox class does not have to override inhabit method, so long as it does not try to call it.

  B. Fox class does not have to override the inhabit method if Forest and Town provide compatible implementations.

  C. Fox class must implement either Forest or Town interfaces, but not both.

  D. The inhabit method implementation from the first interface that Fox implements will take precedence.

  E. Fox class must provide implementation for the inhabit method.

  Correct Answer: B

• Question 38:

  Given:

  

  executed with this command: java Main one two three What is the result?

  A. 0). one

  B. 0). one1). two2). three

  C. The compilation fails.

  D. It creates an infinite loop printing:0). one1). two1). two...

  E. A java.lang.NullPointerException is thrown.

  Correct Answer: D

• Question 39:

  Given:

  

  Which is true?

  A. System.out is the standard output stream. The stream is open only when System.out is called.

  B. System.in cannot reassign the other stream.

  C. System.out is an instance of java.io.OutputStream by default.

  D. System.in is the standard input stream. The stream is already open.

  Correct Answer: D

  Reference: https://www.geeksforgeeks.org/java-lang-system-class-java/

• Question 40:

  Given: What is the result?

  

  A. 9001: java.io.FileNotFoundException: MyFile.txt-MyFile.txt

  B. 9001: APPLICATION ERROR-9001-MyFile.txt 9001: java.io.FileNotFoundException: MyFile.txt-MyFile.txt

  C. 9001: APPLICATION ERROR-9001-MyFile.txt

  D. Compilations fails at Line 1.

  Correct Answer: C