Prepare with Oracle 1z1-830 exam torrent, pass for sure
Updated: Jul 24, 2026
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Oracle 1z1-830 Exam Overview:
| Certification Vendor: | Oracle |
| Exam Name: | Java SE 21 Developer Professional |
| Exam Number: | 1Z0-830 |
| Related Certifications: | Oracle Certified Professional: Java SE 17 Developer Oracle Certified Professional: Java SE 11 Developer |
| Exam Price: | $300 USD |
| Passing Score: | 68% |
| Certificate Validity Period: | 18 months |
| Available Languages: | English, Japanese, Chinese (Simplified) |
| Real Exam Qty: | 50 |
| Exam Format: | Multiple Choice, Multiple Select |
| Exam Duration: | 120 minutes |
| Recommended Training: | Oracle Java SE 21 Developer Training |
| Exam Registration: | Oracle University Registration Pearson VUE |
| Sample Questions: | Oracle 1z1-830 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 1z1-830 Exam Syllabus Topics:
| Section | Weight | Objectives |
|---|---|---|
| Using Object-Oriented Concepts | 20% | - Overloading, overriding, Object class methods, immutable objects - Enums, nested classes, local variable type inference - Classes, records, objects, constructors, initializers, methods, fields, encapsulation - Inheritance, abstract classes, sealed classes, interfaces, polymorphism |
| 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 |
| Modules and Packaging | 5% | - Create and use JAR files, modular and non-modular builds - Module system: module-info.java, exports, requires, provides, uses |
| Advanced Features and Annotations | 3% | - Annotations, built-in annotations, custom annotations - Generics, type parameters, wildcards, type erasure |
| Concurrency and Multithreading | 10% | - Thread lifecycle, Runnable, Callable, ExecutorService, virtual threads - Synchronization, locks, concurrent collections, thread safety |
| Controlling Program Flow | 10% | - Loops: for, enhanced for, while, do-while, break, continue, return - Decision constructs: if-else, switch expressions and statements, pattern matching |
| Handling Exceptions | 8% | - Create and use custom exceptions, throw, throws - Exception hierarchy, try-catch-finally, multi-catch, try-with-resources |
| 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 - Lambda expressions, functional interfaces, method references - Stream API: create, intermediate/terminal operations, parallel streams, grouping, partitioning |
| 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. Given:
java
Optional<String> optionalName = Optional.ofNullable(null);
String bread = optionalName.orElse("Baguette");
System.out.print("bread:" + bread);
String dish = optionalName.orElseGet(() -> "Frog legs");
System.out.print(", dish:" + dish);
try {
String cheese = optionalName.orElseThrow(() -> new Exception());
System.out.println(", cheese:" + cheese);
} catch (Exception exc) {
System.out.println(", no cheese.");
}
What is printed?
A) bread:Baguette, dish:Frog legs, cheese.
B) bread:Baguette, dish:Frog legs, no cheese.
C) bread:bread, dish:dish, cheese.
D) Compilation fails.
2. Which of the following methods of java.util.function.Predicate aredefault methods?
A) test(T t)
B) not(Predicate<? super T> target)
C) or(Predicate<? super T> other)
D) and(Predicate<? super T> other)
E) negate()
F) isEqual(Object targetRef)
3. Given:
java
List<Integer> integers = List.of(0, 1, 2);
integers.stream()
.peek(System.out::print)
.limit(2)
.forEach(i -> {});
What is the output of the given code fragment?
A) 01
B) Nothing
C) Compilation fails
D) 012
E) An exception is thrown
4. 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) Compilation fails.
C) It prints all elements, but changes made during iteration may not be visible.
D) It throws an exception.
5. Given:
java
Object input = 42;
String result = switch (input) {
case String s -> "It's a string with value: " + s;
case Double d -> "It's a double with value: " + d;
case Integer i -> "It's an integer with value: " + i;
};
System.out.println(result);
What is printed?
A) null
B) Compilation fails.
C) It's an integer with value: 42
D) It's a double with value: 42
E) It's a string with value: 42
F) It throws an exception at runtime.
Solutions:
| Question # 1 Answer: B | Question # 2 Answer: C,D,E | Question # 3 Answer: A | Question # 4 Answer: C | Question # 5 Answer: B |
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