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Oracle 1z1-830 Exam Overview:
| Certification Vendor: | Oracle |
| Exam Name: | Oracle Java SE 21 Developer Professional |
| Exam Number: | 1Z0-830 |
| Exam Duration: | 90 minutes |
| Related Certifications: | Oracle Certified Professional: Java SE 17 Developer Oracle Certified Professional: Java SE 11 Developer |
| Exam Format: | Multiple Choice, Multiple Response, Drag and Drop |
| Certificate Validity Period: | Does not expire |
| Real Exam Qty: | 50-60 |
| Available Languages: | English, Japanese |
| Exam Price: | USD 245 (may vary by region) |
| Passing Score: | 68% |
| Recommended Training: | Oracle University Java SE 21 Training |
| Exam Registration: | Oracle Certification Registration |
| Sample Questions: | Oracle 1z1-830 Sample Questions |
| Exam Way: | Online proctored or test center-based exam |
| Pre Condition: | No strict prerequisite, but prior Java programming experience recommended |
| Official Syllabus URL: | https://education.oracle.com |
Oracle 1z1-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Core APIs | - Java standard library usage
|
| Advanced Java Features (Java SE 21) | - Modern language features
|
| Database Connectivity (JDBC) | - Database interaction
|
| Concurrency and Multithreading | - Thread management
|
| Object-Oriented Programming | - Core OOP principles
|
| Input/Output and File Handling | - NIO and file operations
|
| Java Language Fundamentals | - Java syntax and language structure
|
| Exception Handling and Debugging | - Error handling mechanisms
|
Oracle Java SE 21 Developer Professional Sample Questions:
1. What do the following print?
java
import java.time.Duration;
public class DividedDuration {
public static void main(String[] args) {
var day = Duration.ofDays(2);
System.out.print(day.dividedBy(8));
}
}
A) Compilation fails
B) PT0H
C) PT6H
D) It throws an exception
E) PT0D
2. Given:
java
Integer frenchRevolution = 1789;
Object o1 = new String("1789");
Object o2 = frenchRevolution;
frenchRevolution = null;
Object o3 = o2.toString();
System.out.println(o1.equals(o3));
What is printed?
A) A ClassCastException is thrown.
B) true
C) Compilation fails.
D) false
E) A NullPointerException is thrown.
3. Given:
java
List<String> abc = List.of("a", "b", "c");
abc.stream()
.forEach(x -> {
x = x.toUpperCase();
});
abc.stream()
.forEach(System.out::print);
What is the output?
A) An exception is thrown.
B) abc
C) ABC
D) Compilation fails.
4. Given a properties file on the classpath named Person.properties with the content:
ini
name=James
And:
java
public class Person extends ListResourceBundle {
protected Object[][] getContents() {
return new Object[][]{
{"name", "Jeanne"}
};
}
}
And:
java
public class Test {
public static void main(String[] args) {
ResourceBundle bundle = ResourceBundle.getBundle("Person");
String name = bundle.getString("name");
System.out.println(name);
}
}
What is the given program's output?
A) James
B) Compilation fails
C) MissingResourceException
D) JamesJeanne
E) JeanneJames
F) Jeanne
5. What is the output of the following snippet? (Assume the file exists)
java
Path path = Paths.get("C:\\home\\joe\\foo");
System.out.println(path.getName(0));
A) home
B) Compilation error
C) C:
D) C
E) IllegalArgumentException
Solutions:
| Question # 1 Answer: C | Question # 2 Answer: B | Question # 3 Answer: B | Question # 4 Answer: F | Question # 5 Answer: A |
By Evangeline
