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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Which of the following doesnotexist?

A) They all exist.
B) BooleanSupplier
C) LongSupplier
D) DoubleSupplier
E) Supplier<T>
F) BiSupplier<T, U, R>

2. Given:
java
var _ = 3;
var $ = 7;
System.out.println(_ + $);
What is printed?

A) It throws an exception.
B) 10
C) _$
D) Compilation fails.

3. Given:
java
DoubleStream doubleStream = DoubleStream.of(3.3, 4, 5.25, 6.66);
Predicate<Double> doublePredicate = d -> d < 5;
System.out.println(doubleStream.anyMatch(doublePredicate));
What is printed?

A) true
B) false
C) 3.3
D) An exception is thrown at runtime
E) Compilation fails

4. What does the following code print?
java
import java.util.stream.Stream;
public class StreamReduce {
public static void main(String[] args) {
Stream<String> stream = Stream.of("J", "a", "v", "a");
System.out.print(stream.reduce(String::concat));
}
}

A) Java
B) Optional[Java]
C) null
D) Compilation fails

5. Given:
java
Period p = Period.between(
LocalDate.of(2023, Month.MAY, 4),
LocalDate.of(2024, Month.MAY, 4));
System.out.println(p);
Duration d = Duration.between(
LocalDate.of(2023, Month.MAY, 4),
LocalDate.of(2024, Month.MAY, 4));
System.out.println(d);
What is the output?

A) UnsupportedTemporalTypeException
B) P1Y
UnsupportedTemporalTypeException
C) P1Y
PT8784H
D) PT8784H
P1Y

Solutions: