Instant Download Oracle : 1z1-830 Questions & Answers as PDF & Test Engine
Updated: Sep 11, 2026
No. of Questions: 85 Questions & Answers with Testing Engine
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Oracle 1z1-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Handling Date, Time, Text, Numeric and Boolean Values | - Use String, StringBuilder, and related APIs - Use date, time, duration, period, and localization APIs - Work with primitive wrappers and number formatting |
| Topic 2: Modules and Packaging | - Manage dependencies and exports - Create and use Java modules - Package and deploy applications |
| Topic 3: Controlling Program Flow | - Apply decision statements and loops - Use switch expressions and pattern matching - Work with records and sealed classes |
| Topic 4: Annotations and JDBC | - Execute SQL operations and process results - Connect to databases using JDBC - Use built-in and custom annotations |
| Topic 5: Java Concurrency | - Use virtual threads - Create and manage threads - Work with concurrent collections and executors |
| Topic 6: Functional Programming | - Use lambda expressions and method references - Process data using Stream API - Work with functional interfaces |
| Topic 7: Java I/O and NIO | - Use Path, Files, and related APIs - Read and write files - Process file system resources |
| Topic 8: Object-Oriented Programming | - Apply inheritance and polymorphism - Create and use classes, interfaces, enums, and records - Implement encapsulation and abstraction |
| Topic 9: Collections and Generics | - Use sequenced collections and maps - Apply generics and bounded types - Use List, Set, Map, Queue, and Deque implementations |
| Topic 10: Exception Handling | - Handle checked and unchecked exceptions - Use try-with-resources - Create custom exceptions |
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
List<Integer> integers = List.of(0, 1, 2);
integers.stream()
.peek(System.out::print)
.limit(2)
.forEach(i -> {});
What is the output of the given code fragment?
- A. 01
- B. Compilation fails
- C. Nothing
- D. An exception is thrown
- E. 012
Correct Answer: A 🗳️
Explanation: Only visible for ITCertMagic members. You can sign-up / login (it's free).
Which StringBuilder variable fails to compile?
java
public class StringBuilderInstantiations {
public static void main(String[] args) {
var stringBuilder1 = new StringBuilder();
var stringBuilder2 = new StringBuilder(10);
var stringBuilder3 = new StringBuilder("Java");
var stringBuilder4 = new StringBuilder(new char[]{'J', 'a', 'v', 'a'});
}
}
- A. stringBuilder3
- B. None of them
- C. stringBuilder4
- D. stringBuilder1
- E. stringBuilder2
Correct Answer: C 🗳️
Explanation: Only visible for ITCertMagic members. You can sign-up / login (it's free).
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. Compilation fails.
- B. A ClassCastException is thrown.
- C. false
- D. A NullPointerException is thrown.
- E. true
Correct Answer: E 🗳️
Explanation: Only visible for ITCertMagic members. You can sign-up / login (it's free).
Which of the following isn't a valid option of the jdeps command?
- A. --generate-open-module
- B. --list-reduced-deps
- C. --list-deps
- D. --check-deps
- E. --print-module-deps
- F. --generate-module-info
Correct Answer: D 🗳️
Explanation: Only visible for ITCertMagic 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. [Lille, Lyon]
- D. [Lyon, Lille, Toulouse]
- E. [Paris, Toulouse]
Correct Answer: C 🗳️
Explanation: Only visible for ITCertMagic members. You can sign-up / login (it's free).
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