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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Object-Oriented Programming | - Create and use classes, interfaces, enums, and records - Implement encapsulation and abstraction - Apply inheritance and polymorphism |
| Topic 2: Java I/O and NIO | - Use Path, Files, and related APIs - Read and write files - Process file system resources |
| Topic 3: 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 |
| Topic 4: Functional Programming | - Use lambda expressions and method references - Work with functional interfaces - Process data using Stream API |
| Topic 5: Java Concurrency | - Create and manage threads - Use virtual threads - Work with concurrent collections and executors |
| Topic 6: Controlling Program Flow | - Work with records and sealed classes - Use switch expressions and pattern matching - Apply decision statements and loops |
| Topic 7: Modules and Packaging | - Create and use Java modules - Package and deploy applications - Manage dependencies and exports |
| Topic 8: Collections and Generics | - Use List, Set, Map, Queue, and Deque implementations - Apply generics and bounded types - Use sequenced collections and maps |
| Topic 9: Annotations and JDBC | - Execute SQL operations and process results - Connect to databases using JDBC - Use built-in and custom annotations |
| Topic 10: Exception Handling | - Use try-with-resources - Handle checked and unchecked exceptions - Create custom exceptions |
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
var counter = 0;
do {
System.out.print(counter + " ");
} while (++counter < 3);
What is printed?
- A. 0 1 2 3
- B. 0 1 2
- C. 1 2 3
- D. An exception is thrown.
- E. 1 2 3 4
- F. Compilation fails.
Correct Answer: B 🗳️
Explanation: Only visible for PassExamDumps members. You can sign-up / login (it's free).
Given:
java
sealed class Vehicle permits Car, Bike {
}
non-sealed class Car extends Vehicle {
}
final class Bike extends Vehicle {
}
public class SealedClassTest {
public static void main(String[] args) {
Class<?> vehicleClass = Vehicle.class;
Class<?> carClass = Car.class;
Class<?> bikeClass = Bike.class;
System.out.print("Is Vehicle sealed? " + vehicleClass.isSealed() +
"; Is Car sealed? " + carClass.isSealed() +
"; Is Bike sealed? " + bikeClass.isSealed());
}
}
What is printed?
- A. Is Vehicle sealed? true; Is Car sealed? true; Is Bike sealed? true
- B. Is Vehicle sealed? false; Is Car sealed? false; Is Bike sealed? false
- C. Is Vehicle sealed? false; Is Car sealed? true; Is Bike sealed? true
- D. Is Vehicle sealed? true; Is Car sealed? false; Is Bike sealed? false
Correct Answer: D 🗳️
Explanation: Only visible for PassExamDumps 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. [Paris, Toulouse]
- B. [Paris]
- C. [Lyon, Lille, Toulouse]
- D. Compilation fails
- E. [Lille, Lyon]
Correct Answer: E 🗳️
Explanation: Only visible for PassExamDumps members. You can sign-up / login (it's free).
Given:
java
public class SpecialAddition extends Addition implements Special {
public static void main(String[] args) {
System.out.println(new SpecialAddition().add());
}
int add() {
return --foo + bar--;
}
}
class Addition {
int foo = 1;
}
interface Special {
int bar = 1;
}
What is printed?
- A. 2
- B. 0
- C. 1
- D. Compilation fails.
- E. It throws an exception at runtime.
Correct Answer: D 🗳️
Explanation: Only visible for PassExamDumps members. You can sign-up / login (it's free).
Given:
java
public static void main(String[] args) {
try {
throw new IOException();
} catch (IOException e) {
throw new RuntimeException();
} finally {
throw new ArithmeticException();
}
}
What is the output?
- A. IOException
- B. RuntimeException
- C. ArithmeticException
- D. Compilation fails
Correct Answer: C 🗳️
Explanation: Only visible for PassExamDumps members. You can sign-up / login (it's free).
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