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Oracle Java SE 21 Developer Professional Sample Questions:

1. Which of the following statements is correct about a final class?

A) It cannot be extended by any other class.
B) It must contain at least a final method.
C) The final keyword in its declaration must go right before the class keyword.
D) It cannot extend another class.
E) It cannot implement any interface.

2. Which of the following statements are correct?

A) You can use 'final' modifier with all kinds of classes
B) You can use 'public' access modifier with all kinds of classes
C) You can use 'protected' access modifier with all kinds of classes
D) You can use 'private' access modifier with all kinds of classes
E) None

3. Given:
java
var frenchCities = new TreeSet<String>();
frenchCities.add("Paris");
frenchCities.add("Marseille");
frenchCities.add("Lyon");
frenchCities.add("Lille");
frenchCities.add("Toulouse");
System.out.println(frenchCities.headSet("Marseille"));
What will be printed?

A) [Lyon, Lille, Toulouse]
B) [Lille, Lyon]
C) Compilation fails
D) [Paris, Toulouse]
E) [Paris]

4. Given:
java
Period p = Period.between(
LocalDate.of(2023, Month.MAY, 4),
LocalDate.of(2024, Month.MAY, 4));
System.out.println(p);
Duration d = Duration.between(
LocalDate.of(2023, Month.MAY, 4),
LocalDate.of(2024, Month.MAY, 4));
System.out.println(d);
What is the output?

A) UnsupportedTemporalTypeException
B) PT8784H
P1Y
C) P1Y
UnsupportedTemporalTypeException
D) P1Y
PT8784H

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

Solutions: