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Oracle Java SE 21 Developer Professional Sample Questions:

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

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

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

4. Given:
java
interface Calculable {
long calculate(int i);
}
public class Test {
public static void main(String[] args) {
Calculable c1 = i -> i + 1; // Line 1
Calculable c2 = i -> Long.valueOf(i); // Line 2
Calculable c3 = i -> { throw new ArithmeticException(); }; // Line 3
}
}
Which lines fail to compile?

A) Line 1 and line 2
B) Line 1 and line 3
C) Line 3 only
D) Line 2 and line 3
E) The program successfully compiles
F) Line 2 only
G) Line 1 only

5. What do the following print?
java
import java.time.Duration;
public class DividedDuration {
public static void main(String[] args) {
var day = Duration.ofDays(2);
System.out.print(day.dividedBy(8));
}
}

A) Compilation fails
B) It throws an exception
C) PT6H
D) PT0H
E) PT0D

Solutions: