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Oracle Java SE 21 Developer Professional Sample Questions:

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

2. Given:
java
CopyOnWriteArrayList<String> list = new CopyOnWriteArrayList<>();
list.add("A");
list.add("B");
list.add("C");
// Writing in one thread
new Thread(() -> {
list.add("D");
System.out.println("Element added: D");
}).start();
// Reading in another thread
new Thread(() -> {
for (String element : list) {
System.out.println("Read element: " + element);
}
}).start();
What is printed?

A) It throws an exception.
B) It prints all elements, but changes made during iteration may not be visible.
C) Compilation fails.
D) It prints all elements, including changes made during iteration.

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

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

5. Given:
java
public class SpecialAddition extends Addition implements Special {
public static void main(String[] args) {
System.out.println(new SpecialAddition().add());
}
int add() {
return --foo + bar--;
}
}
class Addition {
int foo = 1;
}
interface Special {
int bar = 1;
}
What is printed?

A) 1
B) 0
C) 2
D) Compilation fails.
E) It throws an exception at runtime.

Solutions: