Oracle Java SE 1Z0-819 Questions & Answers

• Question 21:

  Given: What is the result?

  

  A. 42

  B. The compilation fails due to an error in line 4.

  C. 17

  D. The compilation fails due to an error in line 3.

  E. The compilation fails due to an error in line 2.

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

  G. The compilation fails due to an error in line 5.

  Correct Answer: A

• Question 22:

  Given:

  

  You want to examine the items list it contains an item for which the variable count is below zero.

  Which code fragment at line 1 accomplish this?

  A. If (items.stream () .filter (i -> count < 0) . findFirst () ) {

  B. If (items.stream () .filter (i -> count < 0) . findAny () ) {

  C. If (items.stream () .allmatch (i -> count < 0) < 0) ) {

  D. If (items.stream () .anymatch (i -> count < 0) < 0) ) {

  Correct Answer: A

• Question 23:

  Given the code fragment:

  

  What change on line 1 will make this code compile?

  A. Add catch (L |N e).

  B. Add catch (L |M N e).

  C. Add catch (L e).

  D. Add catch (N | L | M e).

  E. Add catch (M |L e).

  Correct Answer: C

• Question 24:

  Assuming the Widget class has a getPrice method, this code does not compile:

  

  Which two statements, independently, would allow this code to compile? (Choose two.)

  A. Replace line 5 with widgetStream.filter(a > ((Widget)a).getPrice() > 20.00).

  B. Replace line 1 with List widgetStream = widgets.stream();.

  C. Replace line 5 with widgetStream.filter((Widget a) > a.getPrice() > 20.00).

  D. Replace line 4 with Stream widgetStream = widgets.stream();.

  Correct Answer: AD

• Question 25:

  Which code is correct?

  A. Runnable r = "Message" > System.out.println();

  B. Runnable r = () > System.out::print;

  C. Runnable r = () -> {System.out.println("Message");};

  D. Runnable r = > System.out.println("Message");

  E. Runnable r = {System.out.println("Message")};

  Correct Answer: C

  Reference: https://www.oracle.com/technical-resources/articles/java/architect-lambdas-part1.html

• Question 26:

  Given:

  

  What is the result?

  A. The compilation fails.

  B. abdf

  C. abd

  D. adf

  E. abcd

  Correct Answer: E

• Question 27:

  Given:

  

  and

  

  Which two method definitions at line n1 in the Bar class compile? (Choose two.)

  A. public List foo(Set m) {...}

  B. public List foo(Set m) {...}

  C. public List foo(TreeSet m) {...}

  D. public List