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Updated: Jul 31, 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 21 Developer |
| Available Languages: | English |
| Exam Duration: | 120 minutes |
| Exam Price: | $245 USD |
| Exam Format: | Multiple Choice |
| Real Exam Qty: | 50 |
| Passing Score: | 68% |
| 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 |
|---|---|
| Exception Handling | - Handle checked and unchecked exceptions - Create custom exceptions - Use try-with-resources |
| Controlling Program Flow | - Use switch expressions and pattern matching - Work with records and sealed classes - Apply decision statements and loops |
| Collections and Generics | - Apply generics and bounded types - Use List, Set, Map, Queue, and Deque implementations - Use sequenced collections and maps |
| Modules and Packaging | - Package and deploy applications - Create and use Java modules - Manage dependencies and exports |
| Functional Programming | - Use lambda expressions and method references - Process data using Stream API - Work with functional interfaces |
| Annotations and JDBC | - Connect to databases using JDBC - Execute SQL operations and process results - Use built-in and custom annotations |
| Java Concurrency | - Work with concurrent collections and executors - Use virtual threads - Create and manage threads |
| Handling Date, Time, Text, Numeric and Boolean Values | - Work with primitive wrappers and number formatting - Use date, time, duration, period, and localization APIs - Use String, StringBuilder, and related APIs |
| Java I/O and NIO | - Use Path, Files, and related APIs - Process file system resources - Read and write files |
| Object-Oriented Programming | - Create and use classes, interfaces, enums, and records - Apply inheritance and polymorphism - Implement encapsulation and abstraction |
Oracle Java SE 21 Developer Professional Sample Questions:
1. Which two of the following aren't the correct ways to create a Stream?
A) Stream stream = Stream.ofNullable("a");
B) Stream stream = Stream.of("a");
C) Stream stream = Stream.empty();
D) Stream stream = Stream.of();
E) Stream<String> stream = Stream.builder().add("a").build();
F) Stream stream = Stream.generate(() -> "a");
G) Stream stream = new Stream();
2. Given:
java
String s = " ";
System.out.print("[" + s.strip());
s = " hello ";
System.out.print("," + s.strip());
s = "h i ";
System.out.print("," + s.strip() + "]");
What is printed?
A) [ , hello ,hi ]
B) [ ,hello,h i]
C) [,hello,hi]
D) [,hello,h i]
3. 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 enabled and the input argument isn't null
B) Only if assertions are enabled and the input argument is null
C) Only if assertions are disabled and the input argument is null
D) Only if assertions are disabled and the input argument isn't null
E) A NullPointerException is never thrown
4. Given:
java
public static void main(String[] args) {
try {
throw new IOException();
} catch (IOException e) {
throw new RuntimeException();
} finally {
throw new ArithmeticException();
}
}
What is the output?
A) IOException
B) RuntimeException
C) Compilation fails
D) ArithmeticException
5. Which three of the following are correct about the Java module system?
A) Code in an explicitly named module can access types in the unnamed module.
B) If a package is defined in both a named module and the unnamed module, then the package in the unnamed module is ignored.
C) The unnamed module exports all of its packages.
D) We must add a module descriptor to make an application developed using a Java version prior to SE9 run on Java 11.
E) The unnamed module can only access packages defined in the unnamed module.
F) If a request is made to load a type whose package is not defined in any known module, then the module system will attempt to load it from the classpath.
Solutions:
| Question # 1 Answer: E,G | Question # 2 Answer: D | Question # 3 Answer: C | Question # 4 Answer: D | Question # 5 Answer: B,C,F |
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