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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Input/Output and File Handling | - NIO and file operations
|
| Java Language Fundamentals | - Java syntax and language structure
|
| Concurrency and Multithreading | - Thread management
|
| Database Connectivity (JDBC) | - Database interaction
|
| Object-Oriented Programming | - Core OOP principles
|
| Core APIs | - Java standard library usage
|
| Advanced Java Features (Java SE 21) | - Modern language features
|
| Exception Handling and Debugging | - Error handling mechanisms
|
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
Optional<String> optionalName = Optional.ofNullable(null);
String bread = optionalName.orElse("Baguette");
System.out.print("bread:" + bread);
String dish = optionalName.orElseGet(() -> "Frog legs");
System.out.print(", dish:" + dish);
try {
String cheese = optionalName.orElseThrow(() -> new Exception());
System.out.println(", cheese:" + cheese);
} catch (Exception exc) {
System.out.println(", no cheese.");
}
What is printed?
- A. bread:bread, dish:dish, cheese.
- B. Compilation fails.
- C. bread:Baguette, dish:Frog legs, cheese.
- D. bread:Baguette, dish:Frog legs, no cheese.
Correct Answer: D 🗳️
Explanation: Only visible for DumpsKing members. You can sign-up / login (it's free).
Given:
java
Optional o1 = Optional.empty();
Optional o2 = Optional.of(1);
Optional o3 = Stream.of(o1, o2)
.filter(Optional::isPresent)
.findAny()
.flatMap(o -> o);
System.out.println(o3.orElse(2));
What is the given code fragment's output?
- A. 2
- B. 0
- C. Optional.empty
- D. An exception is thrown
- E. 1
- F. Compilation fails
- G. Optional[1]
Correct Answer: E 🗳️
Explanation: Only visible for DumpsKing members. You can sign-up / login (it's free).
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. [Paris, Toulouse]
- B. [Lyon, Lille, Toulouse]
- C. [Paris]
- D. Compilation fails
- E. [Lille, Lyon]
Correct Answer: E 🗳️
Explanation: Only visible for DumpsKing members. You can sign-up / login (it's free).
Given:
java
var lyrics = """
Quand il me prend dans ses bras
Qu'il me parle tout bas
Je vois la vie en rose
""";
for ( int i = 0, int j = 3; i < j; i++ ) {
System.out.println( lyrics.lines()
.toList()
.get( i ) );
}
What is printed?
- A. An exception is thrown at runtime.
- B. Compilation fails.
- C. Nothing
- D. vbnet
Quand il me prend dans ses bras
Qu'il me parle tout bas
Je vois la vie en rose
Correct Answer: B 🗳️
Explanation: Only visible for DumpsKing 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? true; Is Car sealed? false; Is Bike sealed? false
- C. Is Vehicle sealed? false; Is Car sealed? false; Is Bike sealed? false
- D. Is Vehicle sealed? false; Is Car sealed? true; Is Bike sealed? true
Correct Answer: B 🗳️
Explanation: Only visible for DumpsKing members. You can sign-up / login (it's free).
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