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Oracle 1z0-830 : Java SE 21 Developer Professional
- Exam Code: 1z0-830
- Exam Name: Java SE 21 Developer Professional
- Updated: Oct 02, 2026
About Oracle 1z0-830 Exam
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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Java Language Fundamentals | - Java syntax and language structure
|
| Core APIs | - Java standard library usage
|
| Input/Output and File Handling | - NIO and file operations
|
| Object-Oriented Programming | - Core OOP principles
|
| Advanced Java Features (Java SE 21) | - Modern language features
|
| Database Connectivity (JDBC) | - Database interaction
|
| Exception Handling and Debugging | - Error handling mechanisms
|
| Concurrency and Multithreading | - Thread management
|
Oracle Java SE 21 Developer Professional Sample Questions:
Question #1
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. stringBuilder4
- B. stringBuilder1
- C. None of them
- D. stringBuilder3
- E. stringBuilder2
Correct Answer: A 🗳️
Explanation: Only visible for TorrentVCE members. You can sign-up / login (it's free).
Question #2
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. 1 2 1
- B. 1 1 1
- C. 1 1 2
- D. 2 1 2
- E. 2 2 2
- F. 1 2 2
- G. 2 1 1
- H. 2 2 1
- I. An exception is thrown.
Correct Answer: F 🗳️
Explanation: Only visible for TorrentVCE members. You can sign-up / login (it's free).
Question #3
Given:
java
String s = " ";
System.out.print("[" + s.strip());
s = " hello ";
System.out.print("," + s.strip());
s = "h i ";
System.out.print("," + s.strip() + "]");
What is printed?
- A. [ , hello ,hi ]
- B. [,hello,h i]
- C. [ ,hello,h i]
- D. [,hello,hi]
Correct Answer: B 🗳️
Explanation: Only visible for TorrentVCE members. You can sign-up / login (it's free).
Question #4
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 #5
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 TorrentVCE members. You can sign-up / login (it's free).
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