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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Advanced Java Features (Java SE 21) | - Modern language features
|
| Concurrency and Multithreading | - Thread management
|
| Database Connectivity (JDBC) | - Database interaction
|
| Exception Handling and Debugging | - Error handling mechanisms
|
| Java Language Fundamentals | - Java syntax and language structure
|
| Input/Output and File Handling | - NIO and file operations
|
| Core APIs | - Java standard library usage
|
| Object-Oriented Programming | - Core OOP principles
|
Oracle Java SE 21 Developer Professional Sample Questions:
What does the following code print?
java
import java.util.stream.Stream;
public class StreamReduce {
public static void main(String[] args) {
Stream<String> stream = Stream.of("J", "a", "v", "a");
System.out.print(stream.reduce(String::concat));
}
}
- A. Optional[Java]
- B. Compilation fails
- C. null
- D. Java
Correct Answer: A 🗳️
Explanation: Only visible for Prep4cram 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. vbnet
Quand il me prend dans ses bras
Qu'il me parle tout bas
Je vois la vie en rose - B. Nothing
- C. Compilation fails.
- D. An exception is thrown at runtime.
Correct Answer: C 🗳️
Explanation: Only visible for Prep4cram 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? false; Is Bike sealed? false
- C. Is Vehicle sealed? true; Is Car sealed? false; Is Bike sealed? false
- D. Is Vehicle sealed? false; Is Car sealed? true; Is Bike sealed? true
Correct Answer: C 🗳️
Explanation: Only visible for Prep4cram members. You can sign-up / login (it's free).
Given:
java
Object input = 42;
String result = switch (input) {
case String s -> "It's a string with value: " + s;
case Double d -> "It's a double with value: " + d;
case Integer i -> "It's an integer with value: " + i;
};
System.out.println(result);
What is printed?
- A. Compilation fails.
- B. It's a double with value: 42
- C. It's a string with value: 42
- D. It's an integer with value: 42
- E. It throws an exception at runtime.
- F. null
Correct Answer: A 🗳️
Explanation: Only visible for Prep4cram members. You can sign-up / login (it's free).
Given:
java
Deque<Integer> deque = new ArrayDeque<>();
deque.offer(1);
deque.offer(2);
var i1 = deque.peek();
var i2 = deque.poll();
var i3 = deque.peek();
System.out.println(i1 + " " + i2 + " " + i3);
What is the output of the given code fragment?
- A. 2 1 2
- B. 1 1 1
- C. 2 2 2
- D. 1 1 2
- E. An exception is thrown.
- F. 2 2 1
- G. 1 2 1
- H. 1 2 2
- I. 2 1 1
Correct Answer: H 🗳️
Explanation: Only visible for Prep4cram members. You can sign-up / login (it's free).
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