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Oracle 1z0-830 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Concurrency and Multithreading	10%	- Synchronization, locks, concurrent collections, thread safety - Thread lifecycle, Runnable, Callable, ExecutorService, virtual threads
Topic 2: Controlling Program Flow	10%	- Decision constructs: if-else, switch expressions and statements, pattern matching - Loops: for, enhanced for, while, do-while, break, continue, return
Topic 3: Working with Arrays and Collections	12%	- Declare, instantiate, initialize, use arrays and multidimensional arrays - Collections Framework: List, Set, Map, Deque, Queue, sorting, searching
Topic 4: Modules and Packaging	5%	- Module system: module-info.java, exports, requires, provides, uses - Create and use JAR files, modular and non-modular builds
Topic 5: Using Object-Oriented Concepts	20%	- Overloading, overriding, Object class methods, immutable objects - Classes, records, objects, constructors, initializers, methods, fields, encapsulation - Inheritance, abstract classes, sealed classes, interfaces, polymorphism - Enums, nested classes, local variable type inference
Topic 6: Handling Exceptions	8%	- Create and use custom exceptions, throw, throws - Exception hierarchy, try-catch-finally, multi-catch, try-with-resources
Topic 7: Functional Programming and Streams	15%	- Optional class, primitive streams - Lambda expressions, functional interfaces, method references - Stream API: create, intermediate/terminal operations, parallel streams, grouping, partitioning
Topic 8: Advanced Features and Annotations	3%	- Generics, type parameters, wildcards, type erasure - Annotations, built-in annotations, custom annotations
Topic 9: Handling Date, Time, Text, Numeric and Boolean Values	12%	- Use Date-Time API: LocalDate, LocalTime, LocalDateTime, Period, Duration, Instant, ZonedDateTime - Manipulate text, text blocks, String, StringBuilder and StringBuffer - Use primitives and wrapper classes, evaluate expressions and apply type conversions
Topic 10: Java I/O and Localization	5%	- File I/O, NIO.2, streams, readers/writers, serialization - Resource bundles, locale, formatting messages, numbers, dates

Oracle Java SE 21 Developer Professional Sample Questions:

1. Which of the following statements are correct?

A) You can use 'private' access modifier with all kinds of classes
B) None
C) You can use 'final' modifier with all kinds of classes
D) You can use 'public' access modifier with all kinds of classes
E) You can use 'protected' access modifier with all kinds of classes

2. Which of the following can be the body of a lambda expression?

A) Two expressions
B) An expression and a statement
C) None of the above
D) Two statements
E) A statement block

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) False
B) True

4. Consider the following methods to load an implementation of MyService using ServiceLoader. Which of the methods are correct? (Choose all that apply)

A) MyService service = ServiceLoader.load(MyService.class).findFirst().get();
B) MyService service = ServiceLoader.getService(MyService.class);
C) MyService service = ServiceLoader.load(MyService.class).iterator().next();
D) MyService service = ServiceLoader.services(MyService.class).getFirstInstance();

5. Given:
java
package vehicule.parent;
public class Car {
protected String brand = "Peugeot";
}
and
java
package vehicule.child;
import vehicule.parent.Car;
public class MiniVan extends Car {
public static void main(String[] args) {
Car car = new Car();
car.brand = "Peugeot 807";
System.out.println(car.brand);
}
}
What is printed?