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Oracle Java SE 21 Developer Professional Sample Questions:

1. What do the following print?
java
import java.time.Duration;
public class DividedDuration {
public static void main(String[] args) {
var day = Duration.ofDays(2);
System.out.print(day.dividedBy(8));
}
}

A) It throws an exception
B) PT6H
C) Compilation fails
D) PT0H
E) PT0D

2. Given:
java
DoubleStream doubleStream = DoubleStream.of(3.3, 4, 5.25, 6.66);
Predicate<Double> doublePredicate = d -> d < 5;
System.out.println(doubleStream.anyMatch(doublePredicate));
What is printed?

A) true
B) An exception is thrown at runtime
C) 3.3
D) false
E) Compilation fails

3. Given:
java
Optional o1 = Optional.empty();
Optional o2 = Optional.of(1);
Optional o3 = Stream.of(o1, o2)
.filter(Optional::isPresent)
.findAny()
.flatMap(o -> o);
System.out.println(o3.orElse(2));
What is the given code fragment's output?

A) An exception is thrown
B) Optional.empty
C) Optional[1]
D) 1
E) Compilation fails
F) 2
G) 0

4. Which of the following statements oflocal variables declared with varareinvalid?(Choose 4)

A) var d[] = new int[4];
B) var h = (g = 7);
C) var e;
D) var a = 1;(Valid: var correctly infers int)
E) var f = { 6 };
F) var b = 2, c = 3.0;

5. Given:
java
var array1 = new String[]{ "foo", "bar", "buz" };
var array2[] = { "foo", "bar", "buz" };
var array3 = new String[3] { "foo", "bar", "buz" };
var array4 = { "foo", "bar", "buz" };
String array5[] = new String[]{ "foo", "bar", "buz" };
Which arrays compile? (Select 2)

A) array4
B) array2
C) array1
D) array5
E) array3

Solutions: