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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

Question 1

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

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

Question 2

Given:
java
try (FileOutputStream fos = new FileOutputStream("t.tmp");
ObjectOutputStream oos = new ObjectOutputStream(fos)) {
fos.write("Today");
fos.writeObject("Today");
oos.write("Today");
oos.writeObject("Today");
} catch (Exception ex) {
// handle exception
}
Which statement compiles?

A. fos.writeObject("Today");
B. fos.write("Today");
C. oos.writeObject("Today");
D. oos.write("Today");

Question 3

Which of the following doesnotexist?

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

Question 4

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

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

Question 5

Given:
java
List<Long> cannesFestivalfeatureFilms = LongStream.range(1, 1945)
.boxed()
.toList();
try (var executor = Executors.newVirtualThreadPerTaskExecutor()) {
cannesFestivalfeatureFilms.stream()
.limit(25)
.forEach(film -> executor.submit(() -> {
System.out.println(film);
}));
}
What is printed?

A. Numbers from 1 to 25 randomly
B. Compilation fails
C. Numbers from 1 to 25 sequentially
D. Numbers from 1 to 1945 randomly
E. An exception is thrown at runtime

Solutions: