Online Access Free 1Z0-816 Exam Questions

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 1 with List<Widget> widgetStream = widgets.stream();.
• B.Replace line 4 with Stream<Widget> widgetStream = widgets.stream();.
• C.Replace line 5 with widgetStream.filter(a -> ((Widget)a).getPrice() > 20.00).
• D.Replace line 5 with widgetStream.filter((Widget a) -> a.getPrice() > 20.00).

var numbers = List.of(0,1,2,3,4,5,6,7,8,9);
You want to calculate the average of numbers. Which two codes will accomplish this? (Choose two.)

• A.double avg = numbers.stream().average().getAsDouble();
• B.double avg = numbers.parallelStream().mapToInt (m -> m).average().getAsDouble ();
• C.double avg = numbers.stream().parallel().averagingDouble(a -> a);
• D.double avg = numbers.stream().mapToInt (i -> i).average().parallel();
• E.double avg = numbers.stream().collect(Collectors.averagingDouble(n -> n));

Given:

What action ensures successful compilation?

• A.Replace public Color(int c) with private Color(int c).
• B.Replace enum Color with public enum Color.
• C.Replace int c; with private int c;.
• D.Replace int c; with private final int c;.
• E.Replace enum Color implements Serializable with public enum Color.

Given:

What is the result?

• A.The compilation fails at line 9.
• B.The compilation fails at line 8.
• C.Hello World
• D.The compilation fails at line 2.

Given:

What is required to make the Foo class thread safe?

• A.Replace the lock constructor call with new ReentrantLock (true).
• B.No change is required.
• C.Make the declaration of lock static.
• D.Move the declaration of lock inside the foo method.