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Oracle 1z0-830 Exam Syllabus Topics:

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

Oracle Java SE 21 Developer Professional Sample Questions:

Question #1

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

Answer: E

Explanation: Only visible for Dumpexams members. You can sign-up / login (it's free).

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

Answer: A

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Question #3

Given:
java
var ceo = new HashMap<>();
ceo.put("Sundar Pichai", "Google");
ceo.put("Tim Cook", "Apple");
ceo.put("Mark Zuckerberg", "Meta");
ceo.put("Andy Jassy", "Amazon");
Does the code compile?

A. True
B. False

Answer: B

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Question #4

Given:
java
public class Versailles {
int mirrorsCount;
int gardensHectares;
void Versailles() { // n1
this.mirrorsCount = 17;
this.gardensHectares = 800;
System.out.println("Hall of Mirrors has " + mirrorsCount + " mirrors."); System.out.println("The gardens cover " + gardensHectares + " hectares.");
}
public static void main(String[] args) {
var castle = new Versailles(); // n2
}
}
What is printed?