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Oracle 1z0-830 Exam Syllabus Topics:

Section	Objectives
Topic 1: Object-Oriented Programming	- Core OOP principles 1. Abstract classes and interfaces 2. Encapsulation, inheritance, polymorphism
Topic 2: Java Language Fundamentals	- Java syntax and language structure 1. Data types, variables, and operators 2. Control flow statements
Topic 3: Advanced Java Features (Java SE 21)	- Modern language features 1. Virtual threads (Project Loom) 2. Records and record patterns 3. Pattern matching for switch 4. Sealed classes
Topic 4: Input/Output and File Handling	- NIO and file operations 1. File, Path, and Streams APIs 2. Serialization basics
Topic 5: Concurrency and Multithreading	- Thread management 1. Virtual threads and structured concurrency concepts 2. Thread lifecycle and synchronization
Topic 6: Exception Handling and Debugging	- Error handling mechanisms 1. Try-with-resources 2. Checked vs unchecked exceptions
Topic 7: Database Connectivity (JDBC)	- Database interaction 1. JDBC API usage 2. SQL execution and result handling
Topic 8: Core APIs	- Java standard library usage 1. Collections Framework 2. Date and Time API 3. Streams and functional programming

Oracle Java SE 21 Developer Professional Sample Questions:

Question #1

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? false; Is Car sealed? false; Is Bike sealed? false
B. Is Vehicle sealed? true; Is Car sealed? true; Is Bike sealed? true
C. Is Vehicle sealed? false; Is Car sealed? true; Is Bike sealed? true
D. Is Vehicle sealed? true; Is Car sealed? false; Is Bike sealed? false

Reveal Solution Discussion 0

Correct Answer: D 🗳️

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Question #2

What do the following print?
java
public class Main {
int instanceVar = staticVar;
static int staticVar = 666;
public static void main(String args[]) {
System.out.printf("%d %d", new Main().instanceVar, staticVar);
}
static {
staticVar = 42;
}
}

A. 666 666
B. 666 42
C. 42 42
D. Compilation fails

Reveal Solution Discussion 0

Correct Answer: C 🗳️

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Question #3

Given:
java
interface A {
default void ma() {
}
}
interface B extends A {
static void mb() {
}
}
interface C extends B {
void ma();
void mc();
}
interface D extends C {
void md();
}
interface E extends D {
default void ma() {
}
default void mb() {
}
default void mc() {
}
}
Which interface can be the target of a lambda expression?

A. D
B. A
C. E
D. C
E. None of the above
F. B

Reveal Solution Discussion 0

Correct Answer: E 🗳️

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Question #4

Given:
java
public class BoomBoom implements AutoCloseable {
public static void main(String[] args) {
try (BoomBoom boomBoom = new BoomBoom()) {
System.out.print("bim ");
throw new Exception();
} catch (Exception e) {
System.out.print("boom ");
}
}
@Override
public void close() throws Exception {
System.out.print("bam ");
throw new RuntimeException();
}
}
What is printed?

A. bim bam boom
B. Compilation fails.
C. bim bam followed by an exception
D. bim boom
E. bim boom bam

Reveal Solution Discussion 0

Correct Answer: A 🗳️

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Question #5

Given:
java
List<Long> cannesFestivalfeatureFilms = LongStream.range(1, 1945)
.boxed()
.toList();
try (var executor = Executors.newVirtualThreadPerTaskExecutor()) {
cannesFestivalfeatureFilms.stream()
.limit(25)
.forEach(film -> executor.submit(() -> {
System.out.println(film);
}));
}
What is printed?