Prepare with Oracle 1z0-830 exam torrent, pass for sure
Last Updated: Oct 28, 2026
No. of Questions: 85 Questions & Answers with Testing Engine
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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Java Language Fundamentals | - Java syntax and language structure
|
| Topic 2: Object-Oriented Programming | - Core OOP principles
|
| Topic 3: Database Connectivity (JDBC) | - Database interaction
|
| Topic 4: Concurrency and Multithreading | - Thread management
|
| Topic 5: Input/Output and File Handling | - NIO and file operations
|
| Topic 6: Core APIs | - Java standard library usage
|
| Topic 7: Advanced Java Features (Java SE 21) | - Modern language features
|
| Topic 8: Exception Handling and Debugging | - Error handling mechanisms
|
Oracle Java SE 21 Developer Professional Sample Questions:
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. It throws an exception
- B. PT6H
- C. Compilation fails
- D. PT0H
- E. PT0D
Correct Answer: B 🗳️
Explanation: Only visible for Test4Sure members. You can sign-up / login (it's free).
Given:
java
public class ThisCalls {
public ThisCalls() {
this(true);
}
public ThisCalls(boolean flag) {
this();
}
}
Which statement is correct?
- A. It compiles.
- B. It does not compile.
- C. It throws an exception at runtime.
Correct Answer: B 🗳️
Explanation: Only visible for Test4Sure members. You can sign-up / login (it's free).
Which methods compile?
- A. ```java
public List<? super IOException> getListSuper() {
return new ArrayList<FileNotFoundException>();
} - B. ```java public List<? super IOException> getListSuper() { return new ArrayList<Exception>(); } csharp
- C. ```java
public List<? extends IOException> getListExtends() {
return new ArrayList<FileNotFoundException>();
} - D. ```java public List<? extends IOException> getListExtends() { return new ArrayList<Exception>(); } csharp
Correct Answer: B,C 🗳️
Explanation: Only visible for Test4Sure members. You can sign-up / login (it's free).
Given:
java
var _ = 3;
var $ = 7;
System.out.println(_ + $);
What is printed?
- A. 10
- B. Compilation fails.
- C. It throws an exception.
- D. _$
Correct Answer: B 🗳️
Explanation: Only visible for Test4Sure members. You can sign-up / login (it's free).
Given:
java
Deque<Integer> deque = new ArrayDeque<>();
deque.offer(1);
deque.offer(2);
var i1 = deque.peek();
var i2 = deque.poll();
var i3 = deque.peek();
System.out.println(i1 + " " + i2 + " " + i3);
What is the output of the given code fragment?
- A. 2 1 2
- B. 2 1 1
- C. 2 2 1
- D. 1 2 1
- E. 1 1 2
- F. An exception is thrown.
- G. 1 2 2
- H. 2 2 2
- I. 1 1 1
Correct Answer: G 🗳️
Explanation: Only visible for Test4Sure members. You can sign-up / login (it's free).
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