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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
String textBlock = """
j \
a \t
v \s
a \
""";
System.out.println(textBlock.length());
What is the output?

A) 10
B) 11
C) 12
D) 14

2. Given:
java
var frenchCities = new TreeSet<String>();
frenchCities.add("Paris");
frenchCities.add("Marseille");
frenchCities.add("Lyon");
frenchCities.add("Lille");
frenchCities.add("Toulouse");
System.out.println(frenchCities.headSet("Marseille"));
What will be printed?

A) [Lille, Lyon]
B) Compilation fails
C) [Paris]
D) [Lyon, Lille, Toulouse]
E) [Paris, Toulouse]

3. Given:
java
Deque<Integer> deque = new ArrayDeque<>();
deque.offer(1);
deque.offer(2);
var i1 = deque.peek();
var i2 = deque.poll();
var i3 = deque.peek();
System.out.println(i1 + " " + i2 + " " + i3);
What is the output of the given code fragment?

A) 2 1 2
B) An exception is thrown.
C) 1 2 1
D) 2 2 2
E) 1 1 2
F) 1 1 1
G) 2 1 1
H) 2 2 1
I) 1 2 2

4. Given:
java
interface SmartPhone {
boolean ring();
}
class Iphone15 implements SmartPhone {
boolean isRinging;
boolean ring() {
isRinging = !isRinging;
return isRinging;
}
}
Choose the right statement.

A) SmartPhone interface does not compile
B) An exception is thrown at running Iphone15.ring();
C) Iphone15 class does not compile
D) Everything compiles

5. Given:
java
public class BoomBoom implements AutoCloseable {
public static void main(String[] args) {
try (BoomBoom boomBoom = new BoomBoom()) {
System.out.print("bim ");
throw new Exception();
} catch (Exception e) {
System.out.print("boom ");
}
}
@Override
public void close() throws Exception {
System.out.print("bam ");
throw new RuntimeException();
}
}
What is printed?

A) bim bam boom
B) bim boom
C) Compilation fails.
D) bim bam followed by an exception
E) bim boom bam

Solutions: