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Updated: Oct 10, 2026
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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Handling Date, Time, Text, Numeric and Boolean Values | 12% | - Use Date-Time API: LocalDate, LocalTime, LocalDateTime, Period, Duration, Instant, ZonedDateTime - Use primitives and wrapper classes, evaluate expressions and apply type conversions - Manipulate text, text blocks, String, StringBuilder and StringBuffer |
| Modules and Packaging | 5% | - Create and use JAR files, modular and non-modular builds - Module system: module-info.java, exports, requires, provides, uses |
| Controlling Program Flow | 10% | - Decision constructs: if-else, switch expressions and statements, pattern matching - Loops: for, enhanced for, while, do-while, break, continue, return |
| Java I/O and Localization | 5% | - File I/O, NIO.2, streams, readers/writers, serialization - Resource bundles, locale, formatting messages, numbers, dates |
| Working with Arrays and Collections | 12% | - Collections Framework: List, Set, Map, Deque, Queue, sorting, searching - Declare, instantiate, initialize, use arrays and multidimensional arrays |
| Using Object-Oriented Concepts | 20% | - Enums, nested classes, local variable type inference - Inheritance, abstract classes, sealed classes, interfaces, polymorphism - Classes, records, objects, constructors, initializers, methods, fields, encapsulation - Overloading, overriding, Object class methods, immutable objects |
| Concurrency and Multithreading | 10% | - Thread lifecycle, Runnable, Callable, ExecutorService, virtual threads - Synchronization, locks, concurrent collections, thread safety |
| Advanced Features and Annotations | 3% | - Generics, type parameters, wildcards, type erasure - Annotations, built-in annotations, custom annotations |
| Functional Programming and Streams | 15% | - Lambda expressions, functional interfaces, method references - Optional class, primitive streams - Stream API: create, intermediate/terminal operations, parallel streams, grouping, partitioning |
| Handling Exceptions | 8% | - Exception hierarchy, try-catch-finally, multi-catch, try-with-resources - Create and use custom exceptions, throw, throws |
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
CopyOnWriteArrayList<String> list = new CopyOnWriteArrayList<>();
list.add("A");
list.add("B");
list.add("C");
// Writing in one thread
new Thread(() -> {
list.add("D");
System.out.println("Element added: D");
}).start();
// Reading in another thread
new Thread(() -> {
for (String element : list) {
System.out.println("Read element: " + element);
}
}).start();
What is printed?
- A. It prints all elements, including changes made during iteration.
- B. It throws an exception.
- C. Compilation fails.
- D. It prints all elements, but changes made during iteration may not be visible.
Correct Answer: D 🗳️
Explanation: Only visible for PrepAwayExam 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? false; Is Car sealed? true; Is Bike sealed? true
- D. Is Vehicle sealed? true; Is Car sealed? false; Is Bike sealed? false
Correct Answer: D 🗳️
Explanation: Only visible for PrepAwayExam members. You can sign-up / login (it's free).
Given:
java
ExecutorService service = Executors.newFixedThreadPool(2);
Runnable task = () -> System.out.println("Task is complete");
service.submit(task);
service.shutdown();
service.submit(task);
What happens when executing the given code fragment?
- A. It prints "Task is complete" once, then exits normally.
- B. It prints "Task is complete" twice, then exits normally.
- C. It prints "Task is complete" once and throws an exception.
- D. It exits normally without printing anything to the console.
- E. It prints "Task is complete" twice and throws an exception.
Correct Answer: C 🗳️
Explanation: Only visible for PrepAwayExam members. You can sign-up / login (it's free).
Given:
java
StringBuilder result = Stream.of("a", "b")
.collect(
() -> new StringBuilder("c"),
StringBuilder::append,
(a, b) -> b.append(a)
);
System.out.println(result);
What is the output of the given code fragment?
- A. acb
- B. cba
- C. cbca
- D. abc
- E. bac
- F. bca
- G. cacb
Correct Answer: B 🗳️
Explanation: Only visible for PrepAwayExam members. You can sign-up / login (it's free).
Given:
java
String s = " ";
System.out.print("[" + s.strip());
s = " hello ";
System.out.print("," + s.strip());
s = "h i ";
System.out.print("," + s.strip() + "]");
What is printed?
- A. [ ,hello,h i]
- B. [ , hello ,hi ]
- C. [,hello,h i]
- D. [,hello,hi]
Correct Answer: C 🗳️
Explanation: Only visible for PrepAwayExam members. You can sign-up / login (it's free).
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