Oracle 1z0-830 actual dump : Java SE 21 Developer Professional

Given:
java
var lyrics = """
Quand il me prend dans ses bras
Qu'il me parle tout bas
Je vois la vie en rose
""";
for ( int i = 0, int j = 3; i < j; i++ ) {
System.out.println( lyrics.lines()
.toList()
.get( i ) );
}
What is printed?

• A. An exception is thrown at runtime.
• B. Compilation fails.
• C. vbnet
  Quand il me prend dans ses bras
  Qu'il me parle tout bas
  Je vois la vie en rose
• D. Nothing

Given:
java
Stream<String> strings = Stream.of("United", "States");
BinaryOperator<String> operator = (s1, s2) -> s1.concat(s2.toUpperCase()); String result = strings.reduce("-", operator); System.out.println(result); What is the output of this code fragment?

• A. -UnitedSTATES
• B. UnitedStates
• C. United-States
• D. -UNITEDSTATES
• E. United-STATES
• F. UNITED-STATES
• G. -UnitedStates

Given:
java
sealed class Vehicle permits Car, Bike {
}
non-sealed class Car extends Vehicle {
}
final class Bike extends Vehicle {
}
public class SealedClassTest {
public static void main(String[] args) {
Class<?> vehicleClass = Vehicle.class;
Class<?> carClass = Car.class;
Class<?> bikeClass = Bike.class;
System.out.print("Is Vehicle sealed? " + vehicleClass.isSealed() +
"; Is Car sealed? " + carClass.isSealed() +
"; Is Bike sealed? " + bikeClass.isSealed());
}
}
What is printed?

• A. Is Vehicle sealed? false; Is Car sealed? true; Is Bike sealed? true
• B. Is Vehicle sealed? true; Is Car sealed? false; Is Bike sealed? false
• C. Is Vehicle sealed? false; Is Car sealed? false; Is Bike sealed? false
• D. Is Vehicle sealed? true; Is Car sealed? true; Is Bike sealed? true

Given:
java
List<String> frenchAuthors = new ArrayList<>();
frenchAuthors.add("Victor Hugo");
frenchAuthors.add("Gustave Flaubert");
Which compiles?

• A. Map<String, List<String>> authorsMap5 = new HashMap<String, List<String>>(); java authorsMap5.put("FR", frenchAuthors);
• B. Map<String, ? extends List<String>> authorsMap2 = new HashMap<String, ArrayList<String>> (); java authorsMap2.put("FR", frenchAuthors);
• C. var authorsMap3 = new HashMap<>();
  java
  authorsMap3.put("FR", frenchAuthors);
• D. Map<String, List<String>> authorsMap4 = new HashMap<String, ArrayList<String>>(); java authorsMap4.put("FR", frenchAuthors);
• E. Map<String, ArrayList<String>> authorsMap1 = new HashMap<>();
  java
  authorsMap1.put("FR", frenchAuthors);

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