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Oracle 1z1-830 Exam Overview:
| Certification Vendor: | Oracle |
|---|---|
| Exam Name: | Java SE 21 Developer Professional |
| Exam Number: | 1Z0-830 |
| Exam Price: | $245 USD |
| Available Languages: | English |
| Related Certifications: | Oracle Certified Professional: Java SE 21 Developer |
| Exam Duration: | 120 minutes |
| Passing Score: | 68% |
| Exam Format: | Multiple Choice |
| Real Exam Qty: | 50 |
| Sample Questions: | Oracle 1z1-830 Sample Questions |
| Exam Way: | Online proctored exam or in-person at Pearson VUE testing centers. |
| Pre Condition: | No mandatory prerequisite certification. Recommended experience with Java programming and modern Java SE features. |
| Official Syllabus URL: | https://education.oracle.com/java-se-21-developer-professional/pexam_1Z0-830 |
Oracle 1z1-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Java I/O and NIO | - Use Path, Files, and related APIs - Process file system resources - Read and write files |
| Java Concurrency | - Create and manage threads - Work with concurrent collections and executors - Use virtual threads |
| 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 |
| Annotations and JDBC | - Connect to databases using JDBC - Execute SQL operations and process results - Use built-in and custom annotations |
| Controlling Program Flow | - Use switch expressions and pattern matching - Apply decision statements and loops - Work with records and sealed classes |
| Collections and Generics | - Use List, Set, Map, Queue, and Deque implementations - Use sequenced collections and maps - Apply generics and bounded types |
| Object-Oriented Programming | - Implement encapsulation and abstraction - Apply inheritance and polymorphism - Create and use classes, interfaces, enums, and records |
| Modules and Packaging | - Create and use Java modules - Package and deploy applications - Manage dependencies and exports |
| Functional Programming | - Use lambda expressions and method references - Work with functional interfaces - Process data using Stream API |
| Exception Handling | - Use try-with-resources - Create custom exceptions - Handle checked and unchecked exceptions |
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
var hauteCouture = new String[]{ "Chanel", "Dior", "Louis Vuitton" };
var i = 0;
do {
System.out.print(hauteCouture[i] + " ");
} while (i++ > 0);
What is printed?
- A. Chanel
- B. An ArrayIndexOutOfBoundsException is thrown at runtime.
- C. Chanel Dior Louis Vuitton
- D. Compilation fails.
Correct Answer: A 🗳️
Explanation: Only visible for Prep4King members. You can sign-up / login (it's free).
Given:
java
import java.io.*;
class A implements Serializable {
int number = 1;
}
class B implements Serializable {
int number = 2;
}
public class Test {
public static void main(String[] args) throws Exception {
File file = new File("o.ser");
A a = new A();
var oos = new ObjectOutputStream(new FileOutputStream(file));
oos.writeObject(a);
oos.close();
var ois = new ObjectInputStream(new FileInputStream(file));
B b = (B) ois.readObject();
ois.close();
System.out.println(b.number);
}
}
What is the given program's output?
- A. Compilation fails
- B. NotSerializableException
- C. 1
- D. ClassCastException
- E. 2
Correct Answer: D 🗳️
Explanation: Only visible for Prep4King members. You can sign-up / login (it's free).
Given:
java
var ceo = new HashMap<>();
ceo.put("Sundar Pichai", "Google");
ceo.put("Tim Cook", "Apple");
ceo.put("Mark Zuckerberg", "Meta");
ceo.put("Andy Jassy", "Amazon");
Does the code compile?
- A. True
- B. False
Correct Answer: B 🗳️
Explanation: Only visible for Prep4King 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]
- B. Compilation fails
- C. [Paris, Toulouse]
- D. [Lyon, Lille, Toulouse]
- E. [Lille, Lyon]
Correct Answer: E 🗳️
Explanation: Only visible for Prep4King 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.services(MyService.class).getFirstInstance();
- B. MyService service = ServiceLoader.getService(MyService.class);
- C. MyService service = ServiceLoader.load(MyService.class).findFirst().get();
- D. MyService service = ServiceLoader.load(MyService.class).iterator().next();
Correct Answer: C,D 🗳️
Explanation: Only visible for Prep4King members. You can sign-up / login (it's free).
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