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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Exception Handling | - Use try-with-resources - Handle checked and unchecked exceptions - Create custom exceptions |
| Topic 2: Annotations and JDBC | - Use built-in and custom annotations - Execute SQL operations and process results - Connect to databases using JDBC |
| Topic 3: Collections and Generics | - Apply generics and bounded types - Use sequenced collections and maps - Use List, Set, Map, Queue, and Deque implementations |
| Topic 4: Functional Programming | - Use lambda expressions and method references - Work with functional interfaces - Process data using Stream API |
| Topic 5: 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 6: Object-Oriented Programming | - Create and use classes, interfaces, enums, and records - Implement encapsulation and abstraction - Apply inheritance and polymorphism |
| Topic 7: Java Concurrency | - Work with concurrent collections and executors - Create and manage threads - Use virtual threads |
| Topic 8: Controlling Program Flow | - Work with records and sealed classes - Apply decision statements and loops - Use switch expressions and pattern matching |
| Topic 9: Java I/O and NIO | - Process file system resources - Read and write files - Use Path, Files, and related APIs |
| Topic 10: Modules and Packaging | - Create and use Java modules - Package and deploy applications - Manage dependencies and exports |
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
var cabarets = new TreeMap<>();
cabarets.put(1, "Moulin Rouge");
cabarets.put(2, "Crazy Horse");
cabarets.put(3, "Paradis Latin");
cabarets.put(4, "Le Lido");
cabarets.put(5, "Folies Bergere");
System.out.println(cabarets.subMap(2, true, 5, false));
What is printed?
- A. An exception is thrown at runtime.
- B. {}
- C. CopyEdit{2=Crazy Horse, 3=Paradis Latin, 4=Le Lido, 5=Folies Bergere}
- D. Compilation fails.
- E. {2=Crazy Horse, 3=Paradis Latin, 4=Le Lido}
Explanation: Only visible for PrepAwayETE 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? true; Is Bike sealed? true
- C. Is Vehicle sealed? false; Is Car sealed? false; Is Bike sealed? false
- D. Is Vehicle sealed? true; Is Car sealed? false; Is Bike sealed? false
Explanation: Only visible for PrepAwayETE members. You can sign-up / login (it's free).
What does the following code print?
java
import java.util.stream.Stream;
public class StreamReduce {
public static void main(String[] args) {
Stream<String> stream = Stream.of("J", "a", "v", "a");
System.out.print(stream.reduce(String::concat));
}
}
- A. Optional[Java]
- B. Compilation fails
- C. Java
- D. null
Explanation: Only visible for PrepAwayETE 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. 0 1 2 3
- B. An exception is thrown.
- C. 1 2 3 4
- D. 0 1 2
- E. Compilation fails.
- F. 1 2 3
Explanation: Only visible for PrepAwayETE members. You can sign-up / login (it's free).
Given:
java
var array1 = new String[]{ "foo", "bar", "buz" };
var array2[] = { "foo", "bar", "buz" };
var array3 = new String[3] { "foo", "bar", "buz" };
var array4 = { "foo", "bar", "buz" };
String array5[] = new String[]{ "foo", "bar", "buz" };
Which arrays compile? (Select 2)
- A. array2
- B. array5
- C. array1
- D. array3
- E. array4
Explanation: Only visible for PrepAwayETE members. You can sign-up / login (it's free).
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