Some companies' dumps expire in three months. Lead2Passed's Oracle Java SE 21 Developer Professional set stays valid for 365 days with free updates — 85 practice questions, renewable at 50% off in 2026.
Oracle 1z1-830 Exam Overview:
| Certification Vendor: | Oracle |
|---|---|
| Exam Name: | Java SE 21 Developer Professional |
| Exam Number: | 1Z0-830 |
| Real Exam Qty: | 50 |
| Available Languages: | English |
| Exam Price: | $245 USD |
| Related Certifications: | Oracle Certified Professional: Java SE 21 Developer |
| Exam Format: | Multiple Choice |
| Passing Score: | 68% |
| Exam Duration: | 120 minutes |
| Sample Questions: | DOWNLOAD DEMO |
| 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 |
|---|---|
| Topic 1: Annotations and JDBC | - Execute SQL operations and process results - Use built-in and custom annotations - Connect to databases using JDBC |
| Topic 2: Collections and Generics | - Apply generics and bounded types - Use sequenced collections and maps - Use List, Set, Map, Queue, and Deque implementations |
| Topic 3: Modules and Packaging | - Create and use Java modules - Package and deploy applications - Manage dependencies and exports |
| Topic 4: Java Concurrency | - Work with concurrent collections and executors - Use virtual threads - Create and manage threads |
| Topic 5: Controlling Program Flow | - Apply decision statements and loops - Work with records and sealed classes - Use switch expressions and pattern matching |
| Topic 6: Functional Programming | - Work with functional interfaces - Use lambda expressions and method references - Process data using Stream API |
| Topic 7: Exception Handling | - Use try-with-resources - Create custom exceptions - Handle checked and unchecked exceptions |
| Topic 8: 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 9: Java I/O and NIO | - Use Path, Files, and related APIs - Read and write files - Process file system resources |
| Topic 10: Object-Oriented Programming | - Implement encapsulation and abstraction - Apply inheritance and polymorphism - Create and use classes, interfaces, enums, and records |
Oracle Java SE 21 Developer Professional Exam FAQ — Valid Answers
The Oracle Java SE 21 Developer Professional blueprint spans 10 domains — including Java Concurrency, Modules and Packaging, Controlling Program Flow. Spend your hours where the percentages are; the full outline above lists every subtopic.
$245 USD per attempt, 68% to pass. Retakes bill the full fee again, so make the first attempt the prepared one — rehearse with the 85 practice questions from Lead2Passed until the mark is comfortably behind you.
120 minutes for 50 questions. Train the pace, don't guess it: the Lead2Passed software and online engines simulate the real test scene and score your performance, so exam day holds no surprises.
No mandatory prerequisite certification. Recommended experience with Java programming and modern Java SE features. Vendors adjust eligibility rules over time — verify the current requirements on the official page (official 1z1-830 exam page) before registering.
Files first: payment triggers an automatic email within a minute — download on unlimited devices, and contact our round-the-clock team if nothing arrives within 2 hours (check spam). Failure is covered: take the corresponding 1z1-830 exam within 60 days of purchase, and if you don't pass, email a scanned enrollment slip plus the official Score Report PDF within 2 days of the exam — we handle it quickly, with the full refund processed within 7 days. Exclusions: exams within 3 days of purchase, candidate names that don't match the payer, and free or expired products. You may instead exchange for two equal-value products free.
Yes — download the free Oracle Java SE 21 Developer Professional demo and inspect real questions before paying. Your purchase then stays valid for 365 days with free updates throughout, renewable afterward at 50% off.
The Oracle Java SE 21 Developer Professional is Oracle's official exam for the Java SE certification, at the Professional level. It validates practical, job-relevant skills — which is why employers shortlist certified candidates. Related credentials include Oracle Certified Professional: Java SE 21 Developer.
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
var _ = 3;
var $ = 7;
System.out.println(_ + $);
What is printed?
- A. 10
- B. It throws an exception.
- C. Compilation fails.
- D. _$
Correct Answer: C 🗳️
Explanation: Only visible for Lead2Passed members. You can sign-up / login (it's free).
Given:
java
public class SpecialAddition extends Addition implements Special {
public static void main(String[] args) {
System.out.println(new SpecialAddition().add());
}
int add() {
return --foo + bar--;
}
}
class Addition {
int foo = 1;
}
interface Special {
int bar = 1;
}
What is printed?
- A. It throws an exception at runtime.
- B. 2
- C. 1
- D. Compilation fails.
- E. 0
Correct Answer: D 🗳️
Explanation: Only visible for Lead2Passed members. You can sign-up / login (it's free).
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. An ArrayIndexOutOfBoundsException is thrown at runtime.
- B. Chanel
- C. Compilation fails.
- D. Chanel Dior Louis Vuitton
Correct Answer: B 🗳️
Explanation: Only visible for Lead2Passed members. You can sign-up / login (it's free).
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. MM dd
- B. MMMM dd
- C. MMM dd
- D. MM d
Correct Answer: B 🗳️
Explanation: Only visible for Lead2Passed members. You can sign-up / login (it's free).
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();
- B. var concurrentHashMap = new ConcurrentHashMap(42);
- C. None of the suggestions.
- D. var concurrentHashMap = new ConcurrentHashMap(42, 10);
- E. var concurrentHashMap = new ConcurrentHashMap(42, 0.88f, 10);
Correct Answer: E 🗳️
Explanation: Only visible for Lead2Passed members. You can sign-up / login (it's free).
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