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Updated: Oct 29, 2026
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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Exception Handling | - Handle checked and unchecked exceptions - Create custom exceptions - Use try-with-resources |
| Java Concurrency | - Use virtual threads - Create and manage threads - Work with concurrent collections and executors |
| Modules and Packaging | - Package and deploy applications - Manage dependencies and exports - Create and use Java modules |
| Controlling Program Flow | - Work with records and sealed classes - Use switch expressions and pattern matching - Apply decision statements and loops |
| Object-Oriented Programming | - Create and use classes, interfaces, enums, and records - Apply inheritance and polymorphism - Implement encapsulation and abstraction |
| Java I/O and NIO | - Read and write files - Use Path, Files, and related APIs - Process file system resources |
| Functional Programming | - Process data using Stream API - Use lambda expressions and method references - Work with functional interfaces |
| Handling Date, Time, Text, Numeric and Boolean Values | - Use date, time, duration, period, and localization APIs - Work with primitive wrappers and number formatting - Use String, StringBuilder, and related APIs |
| Collections and Generics | - Use sequenced collections and maps - Use List, Set, Map, Queue, and Deque implementations - Apply generics and bounded types |
| Annotations and JDBC | - Execute SQL operations and process results - Connect to databases using JDBC - Use built-in and custom annotations |
Oracle Java SE 21 Developer Professional Sample Questions:
You are working on a module named perfumery.shop that depends on another module named perfumery.
provider.
The perfumery.shop module should also make its package perfumery.shop.eaudeparfum available to other modules.
Which of the following is the correct file to declare the perfumery.shop module?
- A. File name: module.java
java
module shop.perfumery {
requires perfumery.provider;
exports perfumery.shop.eaudeparfum;
} - B. File name: module-info.java
java
module perfumery.shop {
requires perfumery.provider;
exports perfumery.shop.eaudeparfum;
} - C. File name: module-info.perfumery.shop.java
java
module perfumery.shop {
requires perfumery.provider;
exports perfumery.shop.eaudeparfum.*;
}
Correct Answer: B 🗳️
Explanation: Only visible for PassLeader members. You can sign-up / login (it's free).
Given:
java
CopyOnWriteArrayList<String> list = new CopyOnWriteArrayList<>();
list.add("A");
list.add("B");
list.add("C");
// Writing in one thread
new Thread(() -> {
list.add("D");
System.out.println("Element added: D");
}).start();
// Reading in another thread
new Thread(() -> {
for (String element : list) {
System.out.println("Read element: " + element);
}
}).start();
What is printed?
- A. It prints all elements, including changes made during iteration.
- B. It throws an exception.
- C. It prints all elements, but changes made during iteration may not be visible.
- D. Compilation fails.
Correct Answer: C 🗳️
Explanation: Only visible for PassLeader members. You can sign-up / login (it's free).
Which of the following suggestions compile?(Choose two.)
- A. java
sealed class Figure permits Rectangle {}
final class Rectangle extends Figure {
float length, width;
} - B. 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;
} - C. java
sealed class Figure permits Rectangle {}
public class Rectangle extends Figure {
float length, width;
} - D. java
public sealed class Figure
permits Circle, Rectangle {}
final class Circle extends Figure {
float radius;
}
non-sealed class Rectangle extends Figure {
float length, width;
}
Correct Answer: A,D 🗳️
Explanation: Only visible for PassLeader 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. ExtendingClass
- B. WithInstanceField
- C. WithStaticField
- D. ImplementingInterface
Correct Answer: C,D 🗳️
Explanation: Only visible for PassLeader members. You can sign-up / login (it's free).
Given:
java
String textBlock = """
j \
a \t
v \s
a \
""";
System.out.println(textBlock.length());
What is the output?
- A. 10
- B. 11
- C. 12
- D. 14
Correct Answer: C 🗳️
Explanation: Only visible for PassLeader members. You can sign-up / login (it's free).
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