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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Handling Date, Time, Text, Numeric and Boolean Values | - Use date, time, duration, period, and localization APIs - Use String, StringBuilder, and related APIs - Work with primitive wrappers and number formatting |
| Collections and Generics | - Use List, Set, Map, Queue, and Deque implementations - Use sequenced collections and maps - Apply generics and bounded types |
| Object-Oriented Programming | - Apply inheritance and polymorphism - Create and use classes, interfaces, enums, and records - Implement encapsulation and abstraction |
| Functional Programming | - Use lambda expressions and method references - Process data using Stream API - Work with functional interfaces |
| Java Concurrency | - Create and manage threads - Work with concurrent collections and executors - Use virtual threads |
| Annotations and JDBC | - Execute SQL operations and process results - Connect to databases using JDBC - Use built-in and custom annotations |
| Java I/O and NIO | - Read and write files - Use Path, Files, and related APIs - Process file system resources |
| Modules and Packaging | - Create and use Java modules - Package and deploy applications - Manage dependencies and exports |
| Exception Handling | - Create custom exceptions - Use try-with-resources - Handle checked and unchecked exceptions |
| Controlling Program Flow | - Work with records and sealed classes - Use switch expressions and pattern matching - Apply decision statements and loops |
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
final Stream<String> strings =
Files.readAllLines(Paths.get("orders.csv"));
strings.skip(1)
.limit(2)
.forEach(System.out::println);
And that the orders.csv file contains:
mathematica
OrderID,Customer,Product,Quantity,Price
1,Kylian Mbappe,Keyboard,2,25.50
2,Teddy Riner,Mouse,1,15.99
3,Sebastien Loeb,Monitor,1,199.99
4,Antoine Griezmann,Headset,3,45.00
What is printed?
- A. Compilation fails.
- B. An exception is thrown at runtime.
- C. arduino
1,Kylian Mbappe,Keyboard,2,25.50
2,Teddy Riner,Mouse,1,15.99
3,Sebastien Loeb,Monitor,1,199.99
4,Antoine Griezmann,Headset,3,45.00 - D. arduino
1,Kylian Mbappe,Keyboard,2,25.50
2,Teddy Riner,Mouse,1,15.99 - E. arduino
2,Teddy Riner,Mouse,1,15.99
3,Sebastien Loeb,Monitor,1,199.99
Explanation: Only visible for Exam-Killer members. You can sign-up / login (it's free).
Given:
java
public class BoomBoom implements AutoCloseable {
public static void main(String[] args) {
try (BoomBoom boomBoom = new BoomBoom()) {
System.out.print("bim ");
throw new Exception();
} catch (Exception e) {
System.out.print("boom ");
}
}
@Override
public void close() throws Exception {
System.out.print("bam ");
throw new RuntimeException();
}
}
What is printed?
- A. bim bam followed by an exception
- B. bim boom bam
- C. Compilation fails.
- D. bim bam boom
- E. bim boom
Explanation: Only visible for Exam-Killer members. You can sign-up / login (it's free).
Given:
java
Optional<String> optionalName = Optional.ofNullable(null);
String bread = optionalName.orElse("Baguette");
System.out.print("bread:" + bread);
String dish = optionalName.orElseGet(() -> "Frog legs");
System.out.print(", dish:" + dish);
try {
String cheese = optionalName.orElseThrow(() -> new Exception());
System.out.println(", cheese:" + cheese);
} catch (Exception exc) {
System.out.println(", no cheese.");
}
What is printed?
- A. bread:Baguette, dish:Frog legs, no cheese.
- B. bread:Baguette, dish:Frog legs, cheese.
- C. Compilation fails.
- D. bread:bread, dish:dish, cheese.
Explanation: Only visible for Exam-Killer members. You can sign-up / login (it's free).
What do the following print?
java
public class DefaultAndStaticMethods {
public static void main(String[] args) {
WithStaticMethod.print();
}
}
interface WithDefaultMethod {
default void print() {
System.out.print("default");
}
}
interface WithStaticMethod extends WithDefaultMethod {
static void print() {
System.out.print("static");
}
}
- A. static
- B. Compilation fails
- C. nothing
- D. default
Explanation: Only visible for Exam-Killer 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. Compilation fails.
- B. Peugeot 807
- C. Peugeot
- D. An exception is thrown at runtime.
Explanation: Only visible for Exam-Killer members. You can sign-up / login (it's free).
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