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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

Question 1

Given:
java
public class Test {
class A {
}
static class B {
}
public static void main(String[] args) {
// Insert here
}
}
Which three of the following are valid statements when inserted into the given program?

A. B b = new Test().new B();
B. A a = new A();
C. B b = new B();
D. A a = new Test().new A();
E. A a = new Test.A();
F. B b = new Test.B();

Question 2

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

A. 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.
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 not thread-safe and does not prevent interference amongconcurrent threads.
E. Element-changing operations on iterators of CopyOnWriteArrayList, such as remove, set, and add, are supported and do not throw UnsupportedOperationException.

Question 3

Given:
java
final Stream<String> strings =
Files.readAllLines(Paths.get("orders.csv"));
strings.skip(1)
.limit(2)
.forEach(System.out::println);
And that the orders.csv file contains:
mathematica
OrderID,Customer,Product,Quantity,Price
1,Kylian Mbappe,Keyboard,2,25.50
2,Teddy Riner,Mouse,1,15.99
3,Sebastien Loeb,Monitor,1,199.99
4,Antoine Griezmann,Headset,3,45.00
What is printed?

A. arduino
1,Kylian Mbappe,Keyboard,2,25.50
2,Teddy Riner,Mouse,1,15.99
3,Sebastien Loeb,Monitor,1,199.99
4,Antoine Griezmann,Headset,3,45.00
B. arduino
1,Kylian Mbappe,Keyboard,2,25.50
2,Teddy Riner,Mouse,1,15.99
C. Compilation fails.
D. An exception is thrown at runtime.
E. arduino
2,Teddy Riner,Mouse,1,15.99
3,Sebastien Loeb,Monitor,1,199.99

Question 4

Given:
java
Map<String, Integer> map = Map.of("b", 1, "a", 3, "c", 2);
TreeMap<String, Integer> treeMap = new TreeMap<>(map);
System.out.println(treeMap);
What is the output of the given code fragment?

A. {c=2, a=3, b=1}
B. {a=3, b=1, c=2}
C. {a=1, b=2, c=3}
D. Compilation fails
E. {b=1, c=2, a=3}
F. {c=1, b=2, a=3}
G. {b=1, a=3, c=2}

Question 5

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. PT0D
C. PT6H
D. It throws an exception
E. Compilation fails

Solutions: