Oracle Java SE 1z1-830

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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
var sList = new CopyOnWriteArrayList<Customer>();
Which of the following statements is correct?

A) Element-changing operations on iterators of CopyOnWriteArrayList, such as remove, set, and add, are supported and do not throw UnsupportedOperationException.
B) The CopyOnWriteArrayList class's iterator reflects all additions, removals, or changes to the list since the iterator was created.
C) The CopyOnWriteArrayList class does not allow null elements.
D) The CopyOnWriteArrayList class is a thread-safe variant of ArrayList where all mutative operations are implemented by making a fresh copy of the underlying array.
E) The CopyOnWriteArrayList class is not thread-safe and does not prevent interference amongconcurrent threads.

2. What is the output of the following snippet? (Assume the file exists)
java
Path path = Paths.get("C:\\home\\joe\\foo");
System.out.println(path.getName(0));

A) Compilation error
B) C
C) home
D) IllegalArgumentException
E) C:

3. What do the following print?
java
import java.time.Duration;
public class DividedDuration {
public static void main(String[] args) {
var day = Duration.ofDays(2);
System.out.print(day.dividedBy(8));
}
}

A) PT0H
B) Compilation fails
C) PT6H
D) It throws an exception
E) PT0D

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) 2
B) 0
C) It throws an exception at runtime.
D) 1
E) Compilation fails.

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

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

Solutions: