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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
record WithInstanceField(String foo, int bar) {
double fuz;
}
record WithStaticField(String foo, int bar) {
static double wiz;
}
record ExtendingClass(String foo) extends Exception {}
record ImplementingInterface(String foo) implements Cloneable {}
Which records compile? (Select 2)

A) ImplementingInterface
B) ExtendingClass
C) WithInstanceField
D) WithStaticField

2. Given:
java
String colors = "red\n" +
"green\n" +
"blue\n";
Which text block can replace the above code?

A) java
String colors = """
red \
green\
blue \
""";
B) java
String colors = """
red
green
blue
""";
C) java
String colors = """
red \s
green\s
blue \s
""";
D) None of the propositions
E) java
String colors = """
red \t
green\t
blue \t
""";

3. 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? true; 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? true; Is Bike sealed? true
D) Is Vehicle sealed? false; Is Car sealed? false; Is Bike sealed? false

4. Which two of the following aren't the correct ways to create a Stream?

A) Stream stream = Stream.of("a");
B) Stream stream = Stream.empty();
C) Stream stream = Stream.of();
D) Stream stream = Stream.ofNullable("a");
E) Stream stream = new Stream();
F) Stream stream = Stream.generate(() -> "a");
G) Stream<String> stream = Stream.builder().add("a").build();

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

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

Solutions: