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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
DoubleSummaryStatistics stats1 = new DoubleSummaryStatistics();
stats1.accept(4.5);
stats1.accept(6.0);
DoubleSummaryStatistics stats2 = new DoubleSummaryStatistics();
stats2.accept(3.0);
stats2.accept(8.5);
stats1.combine(stats2);
System.out.println("Sum: " + stats1.getSum() + ", Max: " + stats1.getMax() + ", Avg: " + stats1.getAverage()); What is printed?

A) An exception is thrown at runtime.
B) Compilation fails.
C) Sum: 22.0, Max: 8.5, Avg: 5.0
D) Sum: 22.0, Max: 8.5, Avg: 5.5

2. Given:
java
Deque<Integer> deque = new ArrayDeque<>();
deque.offer(1);
deque.offer(2);
var i1 = deque.peek();
var i2 = deque.poll();
var i3 = deque.peek();
System.out.println(i1 + " " + i2 + " " + i3);
What is the output of the given code fragment?

A) 2 2 2
B) 2 2 1
C) 1 1 1
D) 1 1 2
E) 2 1 2
F) An exception is thrown.
G) 1 2 2
H) 1 2 1
I) 2 1 1

3. Given:
java
LocalDate localDate = LocalDate.of(2020, 8, 8);
Date date = java.sql.Date.valueOf(localDate);
DateFormat formatter = new SimpleDateFormat(/* pattern */);
String output = formatter.format(date);
System.out.println(output);
It's known that the given code prints out "August 08".
Which of the following should be inserted as the pattern?

A) MMM dd
B) MMMM dd
C) MM dd
D) MM d

4. Which of the following doesnotexist?

A) Supplier<T>
B) DoubleSupplier
C) BooleanSupplier
D) LongSupplier
E) BiSupplier<T, U, R>
F) They all exist.

5. Given:
java
List<Integer> integers = List.of(0, 1, 2);
integers.stream()
.peek(System.out::print)
.limit(2)
.forEach(i -> {});
What is the output of the given code fragment?

A) Compilation fails
B) 012
C) 01
D) An exception is thrown
E) Nothing

Solutions: