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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
package vehicule.parent;
public class Car {
protected String brand = "Peugeot";
}
and
java
package vehicule.child;
import vehicule.parent.Car;
public class MiniVan extends Car {
public static void main(String[] args) {
Car car = new Car();
car.brand = "Peugeot 807";
System.out.println(car.brand);
}
}
What is printed?

A) Compilation fails.
B) Peugeot
C) Peugeot 807
D) An exception is thrown at runtime.

2. Given:
java
Integer frenchRevolution = 1789;
Object o1 = new String("1789");
Object o2 = frenchRevolution;
frenchRevolution = null;
Object o3 = o2.toString();
System.out.println(o1.equals(o3));
What is printed?

A) A ClassCastException is thrown.
B) A NullPointerException is thrown.
C) true
D) Compilation fails.
E) false

3. Given:
java
public class Versailles {
int mirrorsCount;
int gardensHectares;
void Versailles() { // n1
this.mirrorsCount = 17;
this.gardensHectares = 800;
System.out.println("Hall of Mirrors has " + mirrorsCount + " mirrors."); System.out.println("The gardens cover " + gardensHectares + " hectares.");
}
public static void main(String[] args) {
var castle = new Versailles(); // n2
}
}
What is printed?

A) Compilation fails at line n1.
B) nginx
Hall of Mirrors has 17 mirrors.
The gardens cover 800 hectares.
C) Compilation fails at line n2.
D) Nothing
E) An exception is thrown at runtime.

4. Given:
java
Optional<String> optionalName = Optional.ofNullable(null);
String bread = optionalName.orElse("Baguette");
System.out.print("bread:" + bread);
String dish = optionalName.orElseGet(() -> "Frog legs");
System.out.print(", dish:" + dish);
try {
String cheese = optionalName.orElseThrow(() -> new Exception());
System.out.println(", cheese:" + cheese);
} catch (Exception exc) {
System.out.println(", no cheese.");
}
What is printed?

A) bread:bread, dish:dish, cheese.
B) bread:Baguette, dish:Frog legs, cheese.
C) Compilation fails.
D) bread:Baguette, dish:Frog legs, no cheese.

5. How would you create a ConcurrentHashMap configured to allow a maximum of 10 concurrent writer threads and an initial capacity of 42?
Which of the following options meets this requirement?

A) None of the suggestions.
B) var concurrentHashMap = new ConcurrentHashMap(42, 10);
C) var concurrentHashMap = new ConcurrentHashMap();
D) var concurrentHashMap = new ConcurrentHashMap(42);
E) var concurrentHashMap = new ConcurrentHashMap(42, 0.88f, 10);

Solutions: