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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Exception Handling and Debugging | - Error handling mechanisms
|
| Concurrency and Multithreading | - Thread management
|
| Input/Output and File Handling | - NIO and file operations
|
| Advanced Java Features (Java SE 21) | - Modern language features
|
| Database Connectivity (JDBC) | - Database interaction
|
| Object-Oriented Programming | - Core OOP principles
|
| Core APIs | - Java standard library usage
|
| Java Language Fundamentals | - Java syntax and language structure
|
Oracle Java SE 21 Developer Professional Sample Questions:
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 is not thread-safe and does not prevent interference amongconcurrent threads.
- C. 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.
- D. The CopyOnWriteArrayList class's iterator reflects all additions, removals, or changes to the list since the iterator was created.
- E. The CopyOnWriteArrayList class does not allow null elements.
Correct Answer: C 🗳️
Explanation: Only visible for Pass4SureQuiz members. You can sign-up / login (it's free).
Given:
java
var counter = 0;
do {
System.out.print(counter + " ");
} while (++counter < 3);
What is printed?
- A. 1 2 3
- B. 0 1 2 3
- C. An exception is thrown.
- D. Compilation fails.
- E. 0 1 2
- F. 1 2 3 4
Correct Answer: E 🗳️
Explanation: Only visible for Pass4SureQuiz members. You can sign-up / login (it's free).
Given:
java
Stream<String> strings = Stream.of("United", "States");
BinaryOperator<String> operator = (s1, s2) -> s1.concat(s2.toUpperCase()); String result = strings.reduce("-", operator); System.out.println(result); What is the output of this code fragment?
- A. UNITED-STATES
- B. UnitedStates
- C. -UnitedSTATES
- D. United-States
- E. -UnitedStates
- F. United-STATES
- G. -UNITEDSTATES
Correct Answer: C 🗳️
Explanation: Only visible for Pass4SureQuiz members. You can sign-up / login (it's free).
Given:
java
sealed class Vehicle permits Car, Bike {
}
non-sealed class Car extends Vehicle {
}
final class Bike extends Vehicle {
}
public class SealedClassTest {
public static void main(String[] args) {
Class<?> vehicleClass = Vehicle.class;
Class<?> carClass = Car.class;
Class<?> bikeClass = Bike.class;
System.out.print("Is Vehicle sealed? " + vehicleClass.isSealed() +
"; Is Car sealed? " + carClass.isSealed() +
"; Is Bike sealed? " + bikeClass.isSealed());
}
}
What is printed?
- A. Is Vehicle sealed? true; Is Car sealed? true; Is Bike sealed? true
- B. Is Vehicle sealed? false; Is Car sealed? true; Is Bike sealed? true
- C. Is Vehicle sealed? false; Is Car sealed? false; Is Bike sealed? false
- D. Is Vehicle sealed? true; Is Car sealed? false; Is Bike sealed? false
Correct Answer: D 🗳️
Explanation: Only visible for Pass4SureQuiz members. You can sign-up / login (it's free).
Given:
java
List<String> frenchAuthors = new ArrayList<>();
frenchAuthors.add("Victor Hugo");
frenchAuthors.add("Gustave Flaubert");
Which compiles?
- A. Map<String, ArrayList<String>> authorsMap1 = new HashMap<>();
java
authorsMap1.put("FR", frenchAuthors); - B. Map<String, ? extends List<String>> authorsMap2 = new HashMap<String, ArrayList<String>> (); java authorsMap2.put("FR", frenchAuthors);
- C. Map<String, List<String>> authorsMap4 = new HashMap<String, ArrayList<String>>(); java authorsMap4.put("FR", frenchAuthors);
- D. var authorsMap3 = new HashMap<>();
java
authorsMap3.put("FR", frenchAuthors); - E. Map<String, List<String>> authorsMap5 = new HashMap<String, List<String>>(); java authorsMap5.put("FR", frenchAuthors);
Correct Answer: C,D,E 🗳️
Explanation: Only visible for Pass4SureQuiz members. You can sign-up / login (it's free).
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