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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
Stream<String> strings = Stream.of("United", "States");
BinaryOperator<String> operator = (s1, s2) -> s1.concat(s2.toUpperCase()); String result = strings.reduce("-", operator); System.out.println(result); What is the output of this code fragment?

A) UnitedStates
B) United-States
C) -UNITEDSTATES
D) -UnitedSTATES
E) UNITED-STATES
F) United-STATES
G) -UnitedStates

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

3. Which of the following methods of java.util.function.Predicate aredefault methods?

A) test(T t)
B) not(Predicate<? super T> target)
C) or(Predicate<? super T> other)
D) negate()
E) isEqual(Object targetRef)
F) and(Predicate<? super T> other)

4. 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) 2
C) 0
D) Compilation fails.
E) It throws an exception at runtime.

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

Solutions: