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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) PT0D
C) PT0H
D) PT6H
E) Compilation fails

2. Which of the following can be the body of a lambda expression?

A) Two statements
B) Two expressions
C) None of the above
D) An expression and a statement
E) A statement block

3. What is the output of the following snippet? (Assume the file exists)
java
Path path = Paths.get("C:\\home\\joe\\foo");
System.out.println(path.getName(0));

A) IllegalArgumentException
B) home
C) C
D) Compilation error
E) C:

4. Given:
var cabarets = new TreeMap<>();
cabarets.put(1, "Moulin Rouge");
cabarets.put(2, "Crazy Horse");
cabarets.put(3, "Paradis Latin");
cabarets.put(4, "Le Lido");
cabarets.put(5, "Folies Bergere");
System.out.println(cabarets.subMap(2, true, 5, false));
What is printed?

A) {2=Crazy Horse, 3=Paradis Latin, 4=Le Lido}
B) An exception is thrown at runtime.
C) {}
D) CopyEdit{2=Crazy Horse, 3=Paradis Latin, 4=Le Lido, 5=Folies Bergere}
E) Compilation fails.

5. Given:
java
List<String> l1 = new ArrayList<>(List.of("a", "b"));
List<String> l2 = new ArrayList<>(Collections.singletonList("c"));
Collections.copy(l1, l2);
l2.set(0, "d");
System.out.println(l1);
What is the output of the given code fragment?

A) [c, b]
B) An IndexOutOfBoundsException is thrown
C) An UnsupportedOperationException is thrown
D) [d, b]
E) [d]
F) [a, b]

Solutions: