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Updated: Aug 26, 2026
No. of Questions: 85 Questions & Answers with Testing Engine
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Oracle 1z0-830 Exam Overview:
| Certification Vendor: | Oracle |
| Exam Name: | Java SE 21 Developer Professional |
| Exam Number: | 1Z0-830 |
| Exam Format: | Multiple Choice, Multiple Select |
| Exam Price: | $300 USD |
| Certificate Validity Period: | 18 months |
| Exam Duration: | 120 minutes |
| Real Exam Qty: | 50 |
| Related Certifications: | Oracle Certified Professional: Java SE 17 Developer Oracle Certified Professional: Java SE 11 Developer |
| Available Languages: | English, Japanese, Chinese (Simplified) |
| Passing Score: | 68% |
| Recommended Training: | Oracle Java SE 21 Developer Training |
| Exam Registration: | Oracle University Registration Pearson VUE |
| Sample Questions: | Oracle 1z0-830 Sample Questions |
| Exam Way: | Online proctored or onsite at Pearson VUE test centers |
| Pre Condition: | No mandatory prerequisites; recommended 2+ years of Java development experience or equivalent knowledge |
| Official Syllabus URL: | https://education.oracle.com/java-se-21-developer/pexam_1Z0-830 |
Oracle 1z0-830 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Concurrency and Multithreading | 10% | - Thread lifecycle, Runnable, Callable, ExecutorService, virtual threads - Synchronization, locks, concurrent collections, thread safety |
| 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: Advanced Features and Annotations | 3% | - Generics, type parameters, wildcards, type erasure - Annotations, built-in annotations, custom annotations |
| Topic 4: Java I/O and Localization | 5% | - File I/O, NIO.2, streams, readers/writers, serialization - Resource bundles, locale, formatting messages, numbers, dates |
| Topic 5: Functional Programming and Streams | 15% | - Stream API: create, intermediate/terminal operations, parallel streams, grouping, partitioning - Lambda expressions, functional interfaces, method references - Optional class, primitive streams |
| Topic 6: Handling Date, Time, Text, Numeric and Boolean Values | 12% | - Use primitives and wrapper classes, evaluate expressions and apply type conversions - Manipulate text, text blocks, String, StringBuilder and StringBuffer - Use Date-Time API: LocalDate, LocalTime, LocalDateTime, Period, Duration, Instant, ZonedDateTime |
| Topic 7: Modules and Packaging | 5% | - Create and use JAR files, modular and non-modular builds - Module system: module-info.java, exports, requires, provides, uses |
| Topic 8: Handling Exceptions | 8% | - Exception hierarchy, try-catch-finally, multi-catch, try-with-resources - Create and use custom exceptions, throw, throws |
| Topic 9: Working with Arrays and Collections | 12% | - Collections Framework: List, Set, Map, Deque, Queue, sorting, searching - Declare, instantiate, initialize, use arrays and multidimensional arrays |
| Topic 10: Using Object-Oriented Concepts | 20% | - Enums, nested classes, local variable type inference - Overloading, overriding, Object class methods, immutable objects - Inheritance, abstract classes, sealed classes, interfaces, polymorphism - Classes, records, objects, constructors, initializers, methods, fields, encapsulation |
Oracle Java SE 21 Developer Professional Sample Questions:
1. Given:
java
public class Test {
class A {
}
static class B {
}
public static void main(String[] args) {
// Insert here
}
}
Which three of the following are valid statements when inserted into the given program?
A) A a = new Test().new A();
B) A a = new A();
C) B b = new Test().new B();
D) B b = new B();
E) A a = new Test.A();
F) B b = new Test.B();
2. Given:
java
import java.io.*;
class A implements Serializable {
int number = 1;
}
class B implements Serializable {
int number = 2;
}
public class Test {
public static void main(String[] args) throws Exception {
File file = new File("o.ser");
A a = new A();
var oos = new ObjectOutputStream(new FileOutputStream(file));
oos.writeObject(a);
oos.close();
var ois = new ObjectInputStream(new FileInputStream(file));
B b = (B) ois.readObject();
ois.close();
System.out.println(b.number);
}
}
What is the given program's output?
A) 1
B) NotSerializableException
C) 2
D) ClassCastException
E) Compilation fails
3. Given:
java
Runnable task1 = () -> System.out.println("Executing Task-1");
Callable<String> task2 = () -> {
System.out.println("Executing Task-2");
return "Task-2 Finish.";
};
ExecutorService execService = Executors.newCachedThreadPool();
// INSERT CODE HERE
execService.awaitTermination(3, TimeUnit.SECONDS);
execService.shutdownNow();
Which of the following statements, inserted in the code above, printsboth:
"Executing Task-2" and "Executing Task-1"?
A) execService.run(task1);
B) execService.call(task2);
C) execService.call(task1);
D) execService.run(task2);
E) execService.submit(task2);
F) execService.execute(task2);
G) execService.execute(task1);
H) execService.submit(task1);
4. 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 1945 randomly
C) Numbers from 1 to 25 sequentially
D) Numbers from 1 to 25 randomly
E) Compilation fails
5. Given:
java
Stream<String> strings = Stream.of("United", "States");
BinaryOperator<String> operator = (s1, s2) -> s1.concat(s2.toUpperCase()); String result = strings.reduce("-", operator); System.out.println(result); What is the output of this code fragment?
A) -UnitedSTATES
B) -UNITEDSTATES
C) United-States
D) United-STATES
E) -UnitedStates
F) UNITED-STATES
G) UnitedStates
Solutions:
| Question # 1 Answer: A,D,F | Question # 2 Answer: D | Question # 3 Answer: E,H | Question # 4 Answer: D | Question # 5 Answer: A |
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