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Updated: Jul 23, 2026
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Oracle 1z1-830 Exam Overview:
| Certification Vendor: | Oracle |
| Exam Name: | Java SE 21 Developer Professional |
| Exam Number: | 1Z0-830 |
| Available Languages: | English, Japanese, Chinese (Simplified) |
| Exam Duration: | 120 minutes |
| Passing Score: | 68% |
| Exam Price: | $300 USD |
| Exam Format: | Multiple Choice, Multiple Select |
| Related Certifications: | Oracle Certified Professional: Java SE 17 Developer Oracle Certified Professional: Java SE 11 Developer |
| Real Exam Qty: | 50 |
| Certificate Validity Period: | 18 months |
| Recommended Training: | Oracle Java SE 21 Developer Training |
| Exam Registration: | Pearson VUE Oracle University Registration |
| 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 |
|---|---|---|
| Advanced Features and Annotations | 3% | - Generics, type parameters, wildcards, type erasure - Annotations, built-in annotations, custom annotations |
| Working with Arrays and Collections | 12% | - Declare, instantiate, initialize, use arrays and multidimensional arrays - Collections Framework: List, Set, Map, Deque, Queue, sorting, searching |
| Concurrency and Multithreading | 10% | - Thread lifecycle, Runnable, Callable, ExecutorService, virtual threads - Synchronization, locks, concurrent collections, thread safety |
| 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 |
| Handling Exceptions | 8% | - Exception hierarchy, try-catch-finally, multi-catch, try-with-resources - Create and use custom exceptions, throw, throws |
| Modules and Packaging | 5% | - Module system: module-info.java, exports, requires, provides, uses - Create and use JAR files, modular and non-modular builds |
| Using Object-Oriented Concepts | 20% | - Classes, records, objects, constructors, initializers, methods, fields, encapsulation - Inheritance, abstract classes, sealed classes, interfaces, polymorphism - Enums, nested classes, local variable type inference - Overloading, overriding, Object class methods, immutable objects |
| 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% | - 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 |
Oracle Java SE 21 Developer Professional Sample Questions:
1. Which methods compile?
A) ```java public List<? extends IOException> getListExtends() { return new ArrayList<Exception>(); } csharp
B) ```java public List<? super IOException> getListSuper() { return new ArrayList<Exception>(); } csharp
C) ```java
public List<? super IOException> getListSuper() {
return new ArrayList<FileNotFoundException>();
}
D) ```java
public List<? extends IOException> getListExtends() {
return new ArrayList<FileNotFoundException>();
}
2. Given:
java
Deque<Integer> deque = new ArrayDeque<>();
deque.offer(1);
deque.offer(2);
var i1 = deque.peek();
var i2 = deque.poll();
var i3 = deque.peek();
System.out.println(i1 + " " + i2 + " " + i3);
What is the output of the given code fragment?
A) An exception is thrown.
B) 1 1 2
C) 1 1 1
D) 2 1 1
E) 1 2 1
F) 2 2 1
G) 2 2 2
H) 1 2 2
I) 2 1 2
3. 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, no cheese.
B) bread:Baguette, dish:Frog legs, cheese.
C) Compilation fails.
D) bread:bread, dish:dish, cheese.
4. Given:
java
LocalDate localDate = LocalDate.of(2020, 8, 8);
Date date = java.sql.Date.valueOf(localDate);
DateFormat formatter = new SimpleDateFormat(/* pattern */);
String output = formatter.format(date);
System.out.println(output);
It's known that the given code prints out "August 08".
Which of the following should be inserted as the pattern?
A) MMMM dd
B) MMM dd
C) MM dd
D) MM d
5. Given:
java
String textBlock = """
j \
a \t
v \s
a \
""";
System.out.println(textBlock.length());
What is the output?
A) 14
B) 10
C) 11
D) 12
Solutions:
| Question # 1 Answer: B,D | Question # 2 Answer: H | Question # 3 Answer: A | Question # 4 Answer: A | Question # 5 Answer: D |
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