Try and practice the latest Oracle : 1z1-830 real questions & answers
Updated: Sep 12, 2026
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Oracle 1z1-830 Exam Overview:
| Certification Vendor: | Oracle |
|---|---|
| Exam Name: | Oracle 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 Duration: | 90 minutes |
| Real Exam Qty: | 50-60 |
| Available Languages: | English, Japanese |
| Exam Format: | Multiple Choice, Drag and Drop, Multiple Response |
| Passing Score: | 68% |
| Certificate Validity Period: | Does not expire |
| Exam Price: | USD 245 (may vary by region) |
| Recommended Training: | Oracle University Java SE 21 Training |
| Exam Registration: | Oracle Certification Registration |
| Sample Questions: | Oracle 1z1-830 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 1z1-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Java Language Fundamentals | - Java syntax and language structure
|
| Concurrency and Multithreading | - Thread management
|
| Exception Handling and Debugging | - Error handling mechanisms
|
| Advanced Java Features (Java SE 21) | - Modern language features
|
| Object-Oriented Programming | - Core OOP principles
|
| Input/Output and File Handling | - NIO and file operations
|
| Database Connectivity (JDBC) | - Database interaction
|
| Core APIs | - Java standard library usage
|
Oracle Java SE 21 Developer Professional Sample Questions:
Which of the following suggestions compile?(Choose two.)
- A. java
public sealed class Figure
permits Circle, Rectangle {}
final sealed class Circle extends Figure {
float radius;
}
non-sealed class Rectangle extends Figure {
float length, width;
} - B. java
public sealed class Figure
permits Circle, Rectangle {}
final class Circle extends Figure {
float radius;
}
non-sealed class Rectangle extends Figure {
float length, width;
} - C. java
sealed class Figure permits Rectangle {}
final class Rectangle extends Figure {
float length, width;
} - D. java
sealed class Figure permits Rectangle {}
public class Rectangle extends Figure {
float length, width;
}
Correct Answer: B,C 🗳️
Explanation: Only visible for Actual4Cert members. You can sign-up / login (it's free).
What is the output of the following snippet? (Assume the file exists)
java
Path path = Paths.get("C:\\home\\joe\\foo");
System.out.println(path.getName(0));
- A. C:
- B. Compilation error
- C. C
- D. home
- E. IllegalArgumentException
Correct Answer: D 🗳️
Explanation: Only visible for Actual4Cert members. You can sign-up / login (it's free).
Given:
java
record WithInstanceField(String foo, int bar) {
double fuz;
}
record WithStaticField(String foo, int bar) {
static double wiz;
}
record ExtendingClass(String foo) extends Exception {}
record ImplementingInterface(String foo) implements Cloneable {}
Which records compile? (Select 2)
- A. WithInstanceField
- B. ImplementingInterface
- C. WithStaticField
- D. ExtendingClass
Correct Answer: B,C 🗳️
Explanation: Only visible for Actual4Cert members. You can sign-up / login (it's free).
Given:
java
var frenchCities = new TreeSet<String>();
frenchCities.add("Paris");
frenchCities.add("Marseille");
frenchCities.add("Lyon");
frenchCities.add("Lille");
frenchCities.add("Toulouse");
System.out.println(frenchCities.headSet("Marseille"));
What will be printed?
- A. [Lyon, Lille, Toulouse]
- B. [Paris, Toulouse]
- C. [Paris]
- D. Compilation fails
- E. [Lille, Lyon]
Correct Answer: E 🗳️
Explanation: Only visible for Actual4Cert members. You can sign-up / login (it's free).
Given:
java
var counter = 0;
do {
System.out.print(counter + " ");
} while (++counter < 3);
What is printed?
- A. An exception is thrown.
- B. 1 2 3
- C. Compilation fails.
- D. 0 1 2 3
- E. 1 2 3 4
- F. 0 1 2
Correct Answer: F 🗳️
Explanation: Only visible for Actual4Cert members. You can sign-up / login (it's free).
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