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Oracle 1z0-830 Exam Syllabus Topics:

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

Oracle Java SE 21 Developer Professional Sample Questions:

Question #1

What do the following print?
java
public class DefaultAndStaticMethods {
public static void main(String[] args) {
WithStaticMethod.print();
}
}
interface WithDefaultMethod {
default void print() {
System.out.print("default");
}
}
interface WithStaticMethod extends WithDefaultMethod {
static void print() {
System.out.print("static");
}
}

A. default
B. static
C. nothing
D. Compilation fails

Reveal Solution Discussion 0

Correct Answer: B 🗳️

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

Question #2

Which two of the following aren't the correct ways to create a Stream?

A. Stream stream = Stream.of();
B. Stream<String> stream = Stream.builder().add("a").build();
C. Stream stream = new Stream();
D. Stream stream = Stream.generate(() -> "a");
E. Stream stream = Stream.empty();
F. Stream stream = Stream.ofNullable("a");

Reveal Solution Discussion 0

Correct Answer: B,C 🗳️

Question #3

Given:
java
public class ExceptionPropagation {
public static void main(String[] args) {
try {
thrower();
System.out.print("Dom Perignon, ");
} catch (Exception e) {
System.out.print("Chablis, ");
} finally {
System.out.print("Saint-Emilion");
}
}
static int thrower() {
try {
int i = 0;
return i / i;
} catch (NumberFormatException e) {
System.out.print("Rose");
return -1;
} finally {
System.out.print("Beaujolais Nouveau, ");
}
}
}
What is printed?