Try and practice the latest Oracle : 1z1-830 real questions & answers
Updated: Aug 01, 2026
No. of Questions: 85 Questions & Answers with Testing Engine
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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, Multiple Response, Drag and Drop |
| 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:
1. 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;
}
2. 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
3. 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
4. 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]
5. 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
Solutions:
| Question # 1 Answer: B,C | Question # 2 Answer: D | Question # 3 Answer: B,C | Question # 4 Answer: E | Question # 5 Answer: F |
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