Oracle 1z0-830 : Java SE 21 Developer Professional
- Exam Code: 1z0-830
- Exam Name: Java SE 21 Developer Professional
- Updated: Oct 11, 2026
- Q & A: 85 Questions and Answers
About Oracle 1z0-830 Exam
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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Modules and Packaging | - Package and deploy applications - Create and use Java modules - Manage dependencies and exports |
| Controlling Program Flow | - Apply decision statements and loops - Use switch expressions and pattern matching - Work with records and sealed classes |
| Exception Handling | - Handle checked and unchecked exceptions - Use try-with-resources - Create custom exceptions |
| Functional Programming | - Use lambda expressions and method references - Work with functional interfaces - Process data using Stream API |
| Annotations and JDBC | - Use built-in and custom annotations - Connect to databases using JDBC - Execute SQL operations and process results |
| Handling Date, Time, Text, Numeric and Boolean Values | - Use String, StringBuilder, and related APIs - Use date, time, duration, period, and localization APIs - Work with primitive wrappers and number formatting |
| Java Concurrency | - Use virtual threads - Create and manage threads - Work with concurrent collections and executors |
| Java I/O and NIO | - Process file system resources - Read and write files - Use Path, Files, and related APIs |
| Object-Oriented Programming | - Apply inheritance and polymorphism - Implement encapsulation and abstraction - Create and use classes, interfaces, enums, and records |
| Collections and Generics | - Use List, Set, Map, Queue, and Deque implementations - Use sequenced collections and maps - Apply generics and bounded types |
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
StringBuilder result = Stream.of("a", "b")
.collect(
() -> new StringBuilder("c"),
StringBuilder::append,
(a, b) -> b.append(a)
);
System.out.println(result);
What is the output of the given code fragment?
- A. cacb
- B. abc
- C. cbca
- D. bac
- E. cba
- F. acb
- G. bca
Correct Answer: E 🗳️
Explanation: Only visible for Free4Torrent members. You can sign-up / login (it's free).
Given:
java
public class Versailles {
int mirrorsCount;
int gardensHectares;
void Versailles() { // n1
this.mirrorsCount = 17;
this.gardensHectares = 800;
System.out.println("Hall of Mirrors has " + mirrorsCount + " mirrors."); System.out.println("The gardens cover " + gardensHectares + " hectares.");
}
public static void main(String[] args) {
var castle = new Versailles(); // n2
}
}
What is printed?
- A. Compilation fails at line n1.
- B. An exception is thrown at runtime.
- C. nginx
Hall of Mirrors has 17 mirrors.
The gardens cover 800 hectares. - D. Nothing
- E. Compilation fails at line n2.
Correct Answer: A 🗳️
Explanation: Only visible for Free4Torrent members. You can sign-up / login (it's free).
Given:
java
package vehicule.parent;
public class Car {
protected String brand = "Peugeot";
}
and
java
package vehicule.child;
import vehicule.parent.Car;
public class MiniVan extends Car {
public static void main(String[] args) {
Car car = new Car();
car.brand = "Peugeot 807";
System.out.println(car.brand);
}
}
What is printed?
- A. An exception is thrown at runtime.
- B. Peugeot 807
- C. Peugeot
- D. Compilation fails.
Correct Answer: D 🗳️
Explanation: Only visible for Free4Torrent members. You can sign-up / login (it's free).
Given:
java
Integer frenchRevolution = 1789;
Object o1 = new String("1789");
Object o2 = frenchRevolution;
frenchRevolution = null;
Object o3 = o2.toString();
System.out.println(o1.equals(o3));
What is printed?
- A. true
- B. false
- C. Compilation fails.
- D. A ClassCastException is thrown.
- E. A NullPointerException is thrown.
Correct Answer: A 🗳️
Explanation: Only visible for Free4Torrent members. You can sign-up / login (it's free).
Given:
java
public class Test {
class A {
}
static class B {
}
public static void main(String[] args) {
// Insert here
}
}
Which three of the following are valid statements when inserted into the given program?
- A. B b = new B();
- B. A a = new Test().new A();
- C. B b = new Test().new B();
- D. B b = new Test.B();
- E. A a = new Test.A();
- F. A a = new A();
Correct Answer: A,B,D 🗳️
Explanation: Only visible for Free4Torrent members. You can sign-up / login (it's free).
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