Oracle 1z1-830 Q&A - in .pdf
- Exam Code: 1z1-830
- Exam Name: Java SE 21 Developer Professional
- Updated: Oct 03, 2026
- Q & A: 85 Questions and Answers
- Convenient, easy to study.
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- Exam Code: 1z1-830
- Exam Name: Java SE 21 Developer Professional
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- Updated: Oct 03, 2026
- Q & A: 85 Questions and Answers
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Oracle 1z1-830 Q&A - Testing Engine
- Exam Code: 1z1-830
- Exam Name: Java SE 21 Developer Professional
- Updated: Oct 03, 2026
- Q & A: 85 Questions and Answers
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Oracle 1z1-830 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Using Object-Oriented Concepts | 20% | - Inheritance, abstract classes, sealed classes, interfaces, polymorphism - Enums, nested classes, local variable type inference - Classes, records, objects, constructors, initializers, methods, fields, encapsulation - Overloading, overriding, Object class methods, immutable objects |
| Modules and Packaging | 5% | - Module system: module-info.java, exports, requires, provides, uses - Create and use JAR files, modular and non-modular builds |
| Handling Exceptions | 8% | - Create and use custom exceptions, throw, throws - Exception hierarchy, try-catch-finally, multi-catch, try-with-resources |
| Concurrency and Multithreading | 10% | - Thread lifecycle, Runnable, Callable, ExecutorService, virtual threads - Synchronization, locks, concurrent collections, thread safety |
| Working with Arrays and Collections | 12% | - Collections Framework: List, Set, Map, Deque, Queue, sorting, searching - Declare, instantiate, initialize, use arrays and multidimensional arrays |
| Functional Programming and Streams | 15% | - Optional class, primitive streams - Stream API: create, intermediate/terminal operations, parallel streams, grouping, partitioning - Lambda expressions, functional interfaces, method references |
| Advanced Features and Annotations | 3% | - Annotations, built-in annotations, custom annotations - Generics, type parameters, wildcards, type erasure |
| 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 |
| Handling Date, Time, Text, Numeric and Boolean Values | 12% | - Manipulate text, text blocks, String, StringBuilder and StringBuffer - Use primitives and wrapper classes, evaluate expressions and apply type conversions - Use Date-Time API: LocalDate, LocalTime, LocalDateTime, Period, Duration, Instant, ZonedDateTime |
Oracle Java SE 21 Developer Professional Sample Questions:
Which of the following isn't a valid option of the jdeps command?
- A. --print-module-deps
- B. --generate-open-module
- C. --list-deps
- D. --list-reduced-deps
- E. --check-deps
- F. --generate-module-info
Correct Answer: E 🗳️
Explanation: Only visible for Prep4away members. You can sign-up / login (it's free).
Given:
java
void verifyNotNull(Object input) {
boolean enabled = false;
assert enabled = true;
assert enabled;
System.out.println(input.toString());
assert input != null;
}
When does the given method throw a NullPointerException?
- A. Only if assertions are disabled and the input argument isn't null
- B. Only if assertions are disabled and the input argument is null
- C. Only if assertions are enabled and the input argument isn't null
- D. Only if assertions are enabled and the input argument is null
- E. A NullPointerException is never thrown
Correct Answer: B 🗳️
Explanation: Only visible for Prep4away members. You can sign-up / login (it's free).
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. nothing
- B. static
- C. Compilation fails
- D. default
Correct Answer: B 🗳️
Explanation: Only visible for Prep4away members. You can sign-up / login (it's free).
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?
- A. nginx
Hall of Mirrors has 17 mirrors.
The gardens cover 800 hectares. - B. Nothing
- C. Compilation fails at line n2.
- D. An exception is thrown at runtime.
- E. Compilation fails at line n1.
Correct Answer: E 🗳️
Explanation: Only visible for Prep4away members. You can sign-up / login (it's free).
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?
- A. An exception is thrown at runtime
- B. Numbers from 1 to 25 randomly
- C. Numbers from 1 to 1945 randomly
- D. Numbers from 1 to 25 sequentially
- E. Compilation fails
Correct Answer: B 🗳️
Explanation: Only visible for Prep4away members. You can sign-up / login (it's free).
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