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Updated: Sep 16, 2026
No. of Questions: 85 Questions & Answers with Testing Engine
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Oracle 1z0-830 Exam Overview:
| Certification Vendor: | Oracle |
|---|---|
| Exam Name: | Oracle Java SE 21 Developer Professional |
| Exam Number: | 1Z0-830 |
| Certificate Validity Period: | Does not expire |
| Available Languages: | Japanese, English |
| Exam Price: | USD 245 (may vary by region) |
| Real Exam Qty: | 50-60 |
| Exam Format: | Multiple Response, Multiple Choice, Drag and Drop |
| Passing Score: | 68% |
| Exam Duration: | 90 minutes |
| Related Certifications: | Oracle Certified Professional: Java SE 11 Developer Oracle Certified Professional: Java SE 17 Developer |
| Recommended Training: | Oracle University Java SE 21 Training |
| Exam Registration: | Oracle Certification Registration |
| Sample Questions: | Oracle 1z0-830 Sample Questions |
| Exam Way: | Online proctored or test center-based exam |
| Pre Condition: | No strict prerequisite, but prior Java programming experience recommended |
| Official Syllabus URL: | https://education.oracle.com |
Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Advanced Java Features (Java SE 21) | - Modern language features
|
| Topic 2: Exception Handling and Debugging | - Error handling mechanisms
|
| Topic 3: Core APIs | - Java standard library usage
|
| Topic 4: Database Connectivity (JDBC) | - Database interaction
|
| Topic 5: Object-Oriented Programming | - Core OOP principles
|
| Topic 6: Java Language Fundamentals | - Java syntax and language structure
|
| Topic 7: Input/Output and File Handling | - NIO and file operations
|
| Topic 8: Concurrency and Multithreading | - Thread management
|
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
try (FileOutputStream fos = new FileOutputStream("t.tmp");
ObjectOutputStream oos = new ObjectOutputStream(fos)) {
fos.write("Today");
fos.writeObject("Today");
oos.write("Today");
oos.writeObject("Today");
} catch (Exception ex) {
// handle exception
}
Which statement compiles?
- A. fos.writeObject("Today");
- B. oos.writeObject("Today");
- C. fos.write("Today");
- D. oos.write("Today");
Correct Answer: B 🗳️
Explanation: Only visible for Exam-Killer members. You can sign-up / login (it's free).
Which of the following java.io.Console methods doesnotexist?
- A. reader()
- B. readPassword(String fmt, Object... args)
- C. readPassword()
- D. readLine()
- E. read()
- F. readLine(String fmt, Object... args)
Correct Answer: E 🗳️
Explanation: Only visible for Exam-Killer members. You can sign-up / login (it's free).
Given:
java
var ceo = new HashMap<>();
ceo.put("Sundar Pichai", "Google");
ceo.put("Tim Cook", "Apple");
ceo.put("Mark Zuckerberg", "Meta");
ceo.put("Andy Jassy", "Amazon");
Does the code compile?
- A. True
- B. False
Correct Answer: B 🗳️
Explanation: Only visible for Exam-Killer members. You can sign-up / login (it's free).
Given:
java
List<String> frenchAuthors = new ArrayList<>();
frenchAuthors.add("Victor Hugo");
frenchAuthors.add("Gustave Flaubert");
Which compiles?
- A. Map<String, List<String>> authorsMap4 = new HashMap<String, ArrayList<String>>(); java authorsMap4.put("FR", frenchAuthors);
- B. Map<String, List<String>> authorsMap5 = new HashMap<String, List<String>>(); java authorsMap5.put("FR", frenchAuthors);
- C. var authorsMap3 = new HashMap<>();
java
authorsMap3.put("FR", frenchAuthors); - D. Map<String, ? extends List<String>> authorsMap2 = new HashMap<String, ArrayList<String>> (); java authorsMap2.put("FR", frenchAuthors);
- E. Map<String, ArrayList<String>> authorsMap1 = new HashMap<>();
java
authorsMap1.put("FR", frenchAuthors);
Correct Answer: A,B,C 🗳️
Explanation: Only visible for Exam-Killer members. You can sign-up / login (it's free).
Given:
java
var _ = 3;
var $ = 7;
System.out.println(_ + $);
What is printed?
- A. _$
- B. Compilation fails.
- C. 10
- D. It throws an exception.
Correct Answer: B 🗳️
Explanation: Only visible for Exam-Killer members. You can sign-up / login (it's free).
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