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Oracle Java SE 21 Developer Professional Sample Questions:

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

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

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

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

4. Given:
java
Optional o1 = Optional.empty();
Optional o2 = Optional.of(1);
Optional o3 = Stream.of(o1, o2)
.filter(Optional::isPresent)
.findAny()
.flatMap(o -> o);
System.out.println(o3.orElse(2));
What is the given code fragment's output?

A) 1
B) Optional[1]
C) An exception is thrown
D) 2
E) Compilation fails
F) Optional.empty
G) 0

5. Given:
java
System.out.print(Boolean.logicalAnd(1 == 1, 2 < 1));
System.out.print(Boolean.logicalOr(1 == 1, 2 < 1));
System.out.print(Boolean.logicalXor(1 == 1, 2 < 1));
What is printed?

A) truetruetrue
B) truetruefalse
C) Compilation fails
D) truefalsetrue
E) falsetruetrue

Solutions: