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Updated: Sep 02, 2026
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Oracle 1z1-830 Exam Overview:
| Certification Vendor: | Oracle |
|---|---|
| Exam Name: | Java SE 21 Developer Professional |
| Exam Number: | 1Z0-830 |
| Passing Score: | 68% |
| Related Certifications: | Oracle Certified Professional: Java SE 21 Developer |
| Exam Format: | Multiple Choice |
| Available Languages: | English |
| Exam Duration: | 120 minutes |
| Real Exam Qty: | 50 |
| Exam Price: | $245 USD |
| Sample Questions: | Oracle 1z1-830 Sample Questions |
| Exam Way: | Online proctored exam or in-person at Pearson VUE testing centers. |
| Pre Condition: | No mandatory prerequisite certification. Recommended experience with Java programming and modern Java SE features. |
| Official Syllabus URL: | https://education.oracle.com/java-se-21-developer-professional/pexam_1Z0-830 |
Oracle 1z1-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Controlling Program Flow | - Use switch expressions and pattern matching - Work with records and sealed classes - Apply decision statements and loops |
| Annotations and JDBC | - Use built-in and custom annotations - Execute SQL operations and process results - Connect to databases using JDBC |
| Java Concurrency | - Use virtual threads - Create and manage threads - Work with concurrent collections and executors |
| Object-Oriented Programming | - Apply inheritance and polymorphism - Implement encapsulation and abstraction - Create and use classes, interfaces, enums, and records |
| Handling Date, Time, Text, Numeric and Boolean Values | - Use date, time, duration, period, and localization APIs - Work with primitive wrappers and number formatting - Use String, StringBuilder, and related APIs |
| Collections and Generics | - Use sequenced collections and maps - Apply generics and bounded types - Use List, Set, Map, Queue, and Deque implementations |
| Exception Handling | - Use try-with-resources - Create custom exceptions - Handle checked and unchecked exceptions |
| Java I/O and NIO | - Use Path, Files, and related APIs - Read and write files - Process file system resources |
| Modules and Packaging | - Create and use Java modules - Package and deploy applications - Manage dependencies and exports |
| Functional Programming | - Use lambda expressions and method references - Process data using Stream API - Work with functional interfaces |
Oracle Java SE 21 Developer Professional Sample Questions:
Question 1
Given:
var cabarets = new TreeMap<>();
cabarets.put(1, "Moulin Rouge");
cabarets.put(2, "Crazy Horse");
cabarets.put(3, "Paradis Latin");
cabarets.put(4, "Le Lido");
cabarets.put(5, "Folies Bergere");
System.out.println(cabarets.subMap(2, true, 5, false));
What is printed?
A. {}
B. {2=Crazy Horse, 3=Paradis Latin, 4=Le Lido}
C. Compilation fails.
D. CopyEdit{2=Crazy Horse, 3=Paradis Latin, 4=Le Lido, 5=Folies Bergere}
E. An exception is thrown at runtime.
Question 2
Which of the following statements are correct?
A. You can use 'protected' access modifier with all kinds of classes
B. You can use 'private' access modifier with all kinds of classes
C. You can use 'final' modifier with all kinds of classes
D. None
E. You can use 'public' access modifier with all kinds of classes
Question 3
Which of the following doesnotexist?
A. Supplier<T>
B. DoubleSupplier
C. BiSupplier<T, U, R>
D. They all exist.
E. LongSupplier
F. BooleanSupplier
Question 4
Given:
java
Period p = Period.between(
LocalDate.of(2023, Month.MAY, 4),
LocalDate.of(2024, Month.MAY, 4));
System.out.println(p);
Duration d = Duration.between(
LocalDate.of(2023, Month.MAY, 4),
LocalDate.of(2024, Month.MAY, 4));
System.out.println(d);
What is the output?
A. UnsupportedTemporalTypeException
B. P1Y
PT8784H
C. PT8784H
P1Y
D. P1Y
UnsupportedTemporalTypeException
Question 5
Which of the followingisn'ta correct way to write a string to a file?
A. java
try (PrintWriter printWriter = new PrintWriter("file.txt")) {
printWriter.printf("Hello %s", "James");
}
B. java
try (FileOutputStream outputStream = new FileOutputStream("file.txt")) { byte[] strBytes = "Hello".getBytes(); outputStream.write(strBytes);
}
C. java
try (FileWriter writer = new FileWriter("file.txt")) {
writer.write("Hello");
}
D. None of the suggestions
E. java
Path path = Paths.get("file.txt");
byte[] strBytes = "Hello".getBytes();
Files.write(path, strBytes);
F. java
try (BufferedWriter writer = new BufferedWriter("file.txt")) {
writer.write("Hello");
}
Solutions:
| Question 1 Answer: B | Question 2 Answer: D | Question 3 Answer: C | Question 4 Answer: D | Question 5 Answer: F |
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