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Oracle 1z1-830 : Java SE 21 Developer Professional
- Exam Code: 1z1-830
- Exam Name: Java SE 21 Developer Professional
- Updated: Oct 04, 2026
About Oracle 1z1-830 Exam
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Oracle 1z1-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Java I/O and NIO | - Process file system resources - Read and write files - Use Path, Files, and related APIs |
| Topic 2: Functional Programming | - Work with functional interfaces - Use lambda expressions and method references - Process data using Stream API |
| Topic 3: Controlling Program Flow | - Work with records and sealed classes - Use switch expressions and pattern matching - Apply decision statements and loops |
| Topic 4: Annotations and JDBC | - Connect to databases using JDBC - Use built-in and custom annotations - Execute SQL operations and process results |
| 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: Java Concurrency | - Work with concurrent collections and executors - Create and manage threads - Use virtual threads |
| Topic 7: Object-Oriented Programming | - Create and use classes, interfaces, enums, and records - Implement encapsulation and abstraction - Apply inheritance and polymorphism |
| Topic 8: Modules and Packaging | - Package and deploy applications - Create and use Java modules - Manage dependencies and exports |
| Topic 9: Collections and Generics | - Apply generics and bounded types - Use List, Set, Map, Queue, and Deque implementations - Use sequenced collections and maps |
| Topic 10: Exception Handling | - Use try-with-resources - Handle checked and unchecked exceptions - Create custom exceptions |
Oracle Java SE 21 Developer Professional Sample Questions:
Question #1
Given:
java
StringBuffer us = new StringBuffer("US");
StringBuffer uk = new StringBuffer("UK");
Stream<StringBuffer> stream = Stream.of(us, uk);
String output = stream.collect(Collectors.joining("-", "=", ""));
System.out.println(output);
What is the given code fragment's output?
- A. Compilation fails.
- B. US-UK
- C. =US-UK
- D. -US=UK
- E. US=UK
- F. An exception is thrown.
Correct Answer: C 🗳️
Explanation: Only visible for TorrentVCE members. You can sign-up / login (it's free).
Question #2
Given:
java
LocalDate localDate = LocalDate.of(2020, 8, 8);
Date date = java.sql.Date.valueOf(localDate);
DateFormat formatter = new SimpleDateFormat(/* pattern */);
String output = formatter.format(date);
System.out.println(output);
It's known that the given code prints out "August 08".
Which of the following should be inserted as the pattern?
- A. MMMM dd
- B. MM dd
- C. MM d
- D. MMM dd
Correct Answer: A 🗳️
Explanation: Only visible for TorrentVCE members. You can sign-up / login (it's free).
Question #3
Which methods compile?
- A. ```java
public List<? super IOException> getListSuper() {
return new ArrayList<FileNotFoundException>();
} - B. ```java
public List<? extends IOException> getListExtends() {
return new ArrayList<FileNotFoundException>();
} - C. ```java public List<? super IOException> getListSuper() { return new ArrayList<Exception>(); } csharp
- D. ```java public List<? extends IOException> getListExtends() { return new ArrayList<Exception>(); } csharp
Correct Answer: B,C 🗳️
Explanation: Only visible for TorrentVCE members. You can sign-up / login (it's free).
Question #4
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. 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 - C. An exception is thrown at runtime.
- D. arduino
2,Teddy Riner,Mouse,1,15.99
3,Sebastien Loeb,Monitor,1,199.99 - E. arduino
1,Kylian Mbappe,Keyboard,2,25.50
2,Teddy Riner,Mouse,1,15.99
Correct Answer: A,C 🗳️
Explanation: Only visible for TorrentVCE members. You can sign-up / login (it's free).
Question #5
Given:
java
package com.vv;
import java.time.LocalDate;
public class FetchService {
public static void main(String[] args) throws Exception {
FetchService service = new FetchService();
String ack = service.fetch();
LocalDate date = service.fetch();
System.out.println(ack + " the " + date.toString());
}
public String fetch() {
return "ok";
}
public LocalDate fetch() {
return LocalDate.now();
}
}
What will be the output?
- A. ok the 2024-07-10T07:17:45.523939600
- B. ok the 2024-07-10
- C. Compilation fails
- D. An exception is thrown
Correct Answer: C 🗳️
Explanation: Only visible for TorrentVCE members. You can sign-up / login (it's free).
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