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Java SE 21 Developer Professional: 1z0-830 Exam
"Java SE 21 Developer Professional", also known as 1z0-830 exam, is a Oracle Certification. With the complete collection of questions and answers, Pass4sureCert has assembled to take you through 85 Q&As to your 1z0-830 Exam preparation. In the 1z0-830 exam resources, you will cover every field and category in Java SE Certification helping to ready you for your successful Oracle Certification.
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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Annotations and JDBC | - Use built-in and custom annotations - Execute SQL operations and process results - Connect to databases using JDBC |
| Topic 2: Controlling Program Flow | - Work with records and sealed classes - Use switch expressions and pattern matching - Apply decision statements and loops |
| Topic 3: Java Concurrency | - Create and manage threads - Use virtual threads - Work with concurrent collections and executors |
| Topic 4: Handling Date, Time, Text, Numeric and Boolean Values | - Use String, StringBuilder, and related APIs - Work with primitive wrappers and number formatting - Use date, time, duration, period, and localization APIs |
| Topic 5: Modules and Packaging | - Create and use Java modules - Package and deploy applications - Manage dependencies and exports |
| Topic 6: Object-Oriented Programming | - Create and use classes, interfaces, enums, and records - Apply inheritance and polymorphism - Implement encapsulation and abstraction |
| Topic 7: Collections and Generics | - Apply generics and bounded types - Use sequenced collections and maps - Use List, Set, Map, Queue, and Deque implementations |
| Topic 8: Java I/O and NIO | - Read and write files - Use Path, Files, and related APIs - Process file system resources |
| Topic 9: Exception Handling | - Handle checked and unchecked exceptions - Use try-with-resources - Create custom exceptions |
| Topic 10: Functional Programming | - Use lambda expressions and method references - Work with functional interfaces - Process data using Stream API |
Oracle Java SE 21 Developer Professional Sample Questions:
What do the following print?
java
public class Main {
int instanceVar = staticVar;
static int staticVar = 666;
public static void main(String args[]) {
System.out.printf("%d %d", new Main().instanceVar, staticVar);
}
static {
staticVar = 42;
}
}
- A. 42 42
- B. 666 666
- C. 666 42
- D. Compilation fails
Correct Answer: A 🗳️
Explanation: Only visible for Pass4sureCert members. You can sign-up / login (it's free).
Which of the following statements are correct?
- A. None
- B. You can use 'private' access modifier with all kinds of classes
- C. You can use 'protected' access modifier with all kinds of classes
- D. You can use 'final' modifier with all kinds of classes
- E. You can use 'public' access modifier with all kinds of classes
Correct Answer: A 🗳️
Explanation: Only visible for Pass4sureCert members. You can sign-up / login (it's free).
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. Compilation fails.
- C. CopyEdit{2=Crazy Horse, 3=Paradis Latin, 4=Le Lido, 5=Folies Bergere}
- D. {2=Crazy Horse, 3=Paradis Latin, 4=Le Lido}
- E. {}
Correct Answer: D 🗳️
Explanation: Only visible for Pass4sureCert members. You can sign-up / login (it's free).
Consider the following methods to load an implementation of MyService using ServiceLoader. Which of the methods are correct? (Choose all that apply)
- A. MyService service = ServiceLoader.load(MyService.class).findFirst().get();
- B. MyService service = ServiceLoader.services(MyService.class).getFirstInstance();
- C. MyService service = ServiceLoader.load(MyService.class).iterator().next();
- D. MyService service = ServiceLoader.getService(MyService.class);
Correct Answer: A,C 🗳️
Explanation: Only visible for Pass4sureCert 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
sealed class Figure permits Rectangle {}
public class Rectangle extends Figure {
float length, width;
} - C. 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;
} - 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 Pass4sureCert members. You can sign-up / login (it's free).
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