Oracle Java SE 1Z0-819 Questions & Answers

• Question 241:

  Given:

  

  What is the result?

  A. b1

  B. 2

  C. b2

  D. 1

  E. b3

  F. 3

  G. The compilation fails due to an error in line 1.

  Correct Answer: F

  

• Question 242:

  Given:

  

  Which is true about line 1?

  A. If the value is not present, a NoSuchElementException is thrown at run time.

  B. It always executes the System.out::print statement.

  C. If the value is not present, a NullPointerException is thrown at run time.

  D. If the value is not present, nothing is done.

  Correct Answer: D

  

• Question 243:

  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.

  Correct Answer: D

  -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 244:

  Given the code fragment:

  

  What is the result?

  A. A java.lang, UnsupportedOperationException is thrown.

  B. True

  C. False

  D. A java.lang.NullPointerException is thrown.

  Correct Answer: A

• Question 245:

  Given:

  

  Which is true?

  A. The code compiles but does not print any result.

  B. The code prints 25.

  C. The code does not compile.

  D. The code throws an exception at runtime.

  Correct Answer: C

• Question 246:

  Given:

  

  Which two lines inserted in line 1 will allow this code to compile? (Choose two.)

  A. protected void walk(){}

  B. void walk(){}

  C. abstract void walk();

  D. private void walk(){}

  E. public abstract void walk();

  Correct Answer: AE

• Question 247:

  Given:

  

  What is the result?

  A. Joe Joe

  B. null Mary

  C. Joe Marry

  D. null null

  Correct Answer: A

  

• Question 248:

  Which code fragment prints 100 random numbers?

  

  A. Option A

  B. Option B

  C. Option C

  D. Option D

  Correct Answer: D

  Reference: https://www.javacodegeeks.com/2014/01/java-util-random-in-java-8.html

• Question 249:

  Given:

  

  Which two lines can replace line 1 so that the Y class compiles? (Choose two.)

  A. map.forEach((k, v) -> set(v)));

  B. set(map.values());

  C. super.set(List map)

  D. super.set(map.values());

  E. set(map)

  Correct Answer: BD

• Question 250:

  Given the code fragment:

  

  Which can replace line 11?

  A. UnaryOperator uo = (var x ) -> (x * 3);

  B. UnaryOperatoruo = var x -> { return x 3 ; };

  C. UnaryOperatoruo = x -> { return x * 3; };

  D. UnaryOperatoruo = (int x) -> x * 3;

  Correct Answer: A