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Oracle Java SE 21 Developer Professional : 1z1-830 valid dump torrent
- Exam Code: 1z1-830
- Exam Name: Java SE 21 Developer Professional
- Updated: Sep 09, 2026
- Q&As: 85 Questions and Answers
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Oracle 1z1-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Object-Oriented Programming | - Create and use classes, interfaces, enums, and records - Apply inheritance and polymorphism - Implement encapsulation and abstraction |
| Topic 2: Java I/O and NIO | - Use Path, Files, and related APIs - Process file system resources - Read and write files |
| Topic 3: Exception Handling | - Create custom exceptions - Use try-with-resources - Handle checked and unchecked exceptions |
| Topic 4: Collections and Generics | - Use sequenced collections and maps - Use List, Set, Map, Queue, and Deque implementations - Apply generics and bounded types |
| Topic 5: 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 |
| Topic 6: Modules and Packaging | - Package and deploy applications - Manage dependencies and exports - Create and use Java modules |
| Topic 7: Annotations and JDBC | - Use built-in and custom annotations - Connect to databases using JDBC - Execute SQL operations and process results |
| Topic 8: Java Concurrency | - Use virtual threads - Create and manage threads - Work with concurrent collections and executors |
| Topic 9: Controlling Program Flow | - Work with records and sealed classes - Apply decision statements and loops - Use switch expressions and pattern matching |
| Topic 10: Functional Programming | - Work with functional interfaces - Process data using Stream API - Use lambda expressions and method references |
Oracle Java SE 21 Developer Professional Sample Questions:
Question #1
How would you create a ConcurrentHashMap configured to allow a maximum of 10 concurrent writer threads and an initial capacity of 42?
Which of the following options meets this requirement?
- A. var concurrentHashMap = new ConcurrentHashMap(42, 10);
- B. var concurrentHashMap = new ConcurrentHashMap(42, 0.88f, 10);
- C. var concurrentHashMap = new ConcurrentHashMap();
- D. var concurrentHashMap = new ConcurrentHashMap(42);
- E. None of the suggestions.
Answer: B
Explanation: Only visible for Free4Dump members. You can sign-up / login (it's free).
Question #2
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. Compilation fails
- B. An exception is thrown
- C. ok the 2024-07-10T07:17:45.523939600
- D. ok the 2024-07-10
Answer: A
Explanation: Only visible for Free4Dump members. You can sign-up / login (it's free).
Question #3
Given:
java
var lyrics = """
Quand il me prend dans ses bras
Qu'il me parle tout bas
Je vois la vie en rose
""";
for ( int i = 0, int j = 3; i < j; i++ ) {
System.out.println( lyrics.lines()
.toList()
.get( i ) );
}
What is printed?
- A. An exception is thrown at runtime.
- B. Compilation fails.
- C. vbnet
Quand il me prend dans ses bras
Qu'il me parle tout bas
Je vois la vie en rose - D. Nothing
Answer: B
Explanation: Only visible for Free4Dump members. You can sign-up / login (it's free).
Question #4
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. PT0H
- B. Compilation fails
- C. It throws an exception
- D. PT0D
- E. PT6H
Answer: E
Explanation: Only visible for Free4Dump members. You can sign-up / login (it's free).
Question #5
Given:
java
CopyOnWriteArrayList<String> list = new CopyOnWriteArrayList<>();
list.add("A");
list.add("B");
list.add("C");
// Writing in one thread
new Thread(() -> {
list.add("D");
System.out.println("Element added: D");
}).start();
// Reading in another thread
new Thread(() -> {
for (String element : list) {
System.out.println("Read element: " + element);
}
}).start();
What is printed?
- A. Compilation fails.
- B. It prints all elements, including changes made during iteration.
- C. It prints all elements, but changes made during iteration may not be visible.
- D. It throws an exception.
Answer: C
Explanation: Only visible for Free4Dump members. You can sign-up / login (it's free).
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