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Updated: Jul 31, 2026
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Oracle 1z0-830 Exam Overview:
| Certification Vendor: | Oracle |
| Exam Name: | Oracle Java SE 21 Developer Professional |
| Exam Number: | 1Z0-830 |
| Exam Price: | USD 245 (may vary by region) |
| Exam Duration: | 90 minutes |
| Real Exam Qty: | 50-60 |
| Related Certifications: | Oracle Certified Professional: Java SE 17 Developer Oracle Certified Professional: Java SE 11 Developer |
| Passing Score: | 68% |
| Certificate Validity Period: | Does not expire |
| Available Languages: | English, Japanese |
| Exam Format: | Multiple Choice, Multiple Response, Drag and Drop |
| Recommended Training: | Oracle University Java SE 21 Training |
| Exam Registration: | Oracle Certification Registration |
| Sample Questions: | Oracle 1z0-830 Sample Questions |
| Exam Way: | Online proctored or test center-based exam |
| Pre Condition: | No strict prerequisite, but prior Java programming experience recommended |
| Official Syllabus URL: | https://education.oracle.com |
Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Core APIs | - Java standard library usage
|
| Concurrency and Multithreading | - Thread management
|
| Input/Output and File Handling | - NIO and file operations
|
| Exception Handling and Debugging | - Error handling mechanisms
|
| Advanced Java Features (Java SE 21) | - Modern language features
|
| Database Connectivity (JDBC) | - Database interaction
|
| Object-Oriented Programming | - Core OOP principles
|
| Java Language Fundamentals | - Java syntax and language structure
|
Oracle Java SE 21 Developer Professional Sample Questions:
1. What does the following code print?
java
import java.util.stream.Stream;
public class StreamReduce {
public static void main(String[] args) {
Stream<String> stream = Stream.of("J", "a", "v", "a");
System.out.print(stream.reduce(String::concat));
}
}
A) Compilation fails
B) null
C) Optional[Java]
D) Java
2. Given:
java
package com.vv;
import java.time.LocalDate;
public class FetchService {
public static void main(String[] args) throws Exception {
FetchService service = new FetchService();
String ack = service.fetch();
LocalDate date = service.fetch();
System.out.println(ack + " the " + date.toString());
}
public String fetch() {
return "ok";
}
public LocalDate fetch() {
return LocalDate.now();
}
}
What will be the output?
A) Compilation fails
B) ok the 2024-07-10
C) ok the 2024-07-10T07:17:45.523939600
D) An exception is thrown
3. Given:
java
StringBuffer us = new StringBuffer("US");
StringBuffer uk = new StringBuffer("UK");
Stream<StringBuffer> stream = Stream.of(us, uk);
String output = stream.collect(Collectors.joining("-", "=", ""));
System.out.println(output);
What is the given code fragment's output?
A) Compilation fails.
B) -US=UK
C) An exception is thrown.
D) US=UK
E) =US-UK
F) US-UK
4. 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.submit(task2);
B) execService.call(task2);
C) execService.execute(task1);
D) execService.run(task2);
E) execService.call(task1);
F) execService.run(task1);
G) execService.submit(task1);
H) execService.execute(task2);
5. Given:
java
public class Test {
static int count;
synchronized Test() {
count++;
}
public static void main(String[] args) throws InterruptedException {
Runnable task = Test::new;
Thread t1 = new Thread(task);
Thread t2 = new Thread(task);
t1.start();
t2.start();
t1.join();
t2.join();
System.out.println(count);
}
}
What is the given program's output?
A) Compilation fails
B) It's either 0 or 1
C) It's always 1
D) It's always 2
E) It's either 1 or 2
Solutions:
| Question # 1 Answer: C | Question # 2 Answer: A | Question # 3 Answer: E | Question # 4 Answer: A,G | Question # 5 Answer: A |
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