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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. 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) [Paris]
C) [Paris, Toulouse]
D) [Lyon, Lille, Toulouse]
E) Compilation fails

2. 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) PT8784H
P1Y
B) UnsupportedTemporalTypeException
C) P1Y
PT8784H
D) P1Y
UnsupportedTemporalTypeException

3. Which of the following doesnotexist?

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

4. Which of the following can be the body of a lambda expression?

A) Two statements
B) An expression and a statement
C) A statement block
D) None of the above
E) Two expressions

5. Given:
java
public class Test {
static int count;
synchronized Test() {
count++;
}
public static void main(String[] args) throws InterruptedException {
Runnable task = Test::new;
Thread t1 = new Thread(task);
Thread t2 = new Thread(task);
t1.start();
t2.start();
t1.join();
t2.join();
System.out.println(count);
}
}
What is the given program's output?

A) It's always 2
B) Compilation fails
C) It's either 0 or 1
D) It's always 1
E) It's either 1 or 2

Solutions: