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Oracle 1z1-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Object-Oriented Programming | - Core OOP principles
|
| Database Connectivity (JDBC) | - Database interaction
|
| Concurrency and Multithreading | - Thread management
|
| Exception Handling and Debugging | - Error handling mechanisms
|
| Advanced Java Features (Java SE 21) | - Modern language features
|
| Java Language Fundamentals | - Java syntax and language structure
|
| Core APIs | - Java standard library usage
|
| Input/Output and File Handling | - NIO and file operations
|
Oracle Java SE 21 Developer Professional Sample Questions:
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. False
- B. True
Correct Answer: A 🗳️
Explanation: Only visible for Prep4sureExam 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. MMM dd
- B. MM dd
- C. MMMM dd
- D. MM d
Correct Answer: C 🗳️
Explanation: Only visible for Prep4sureExam 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 1
- B. 1 2 1
- C. 2 2 2
- D. 1 1 2
- E. 2 2 1
- F. An exception is thrown.
- G. 2 1 2
- H. 1 2 2
- I. 1 1 1
Correct Answer: H 🗳️
Explanation: Only visible for Prep4sureExam members. You can sign-up / login (it's free).
Given:
java
public class BoomBoom implements AutoCloseable {
public static void main(String[] args) {
try (BoomBoom boomBoom = new BoomBoom()) {
System.out.print("bim ");
throw new Exception();
} catch (Exception e) {
System.out.print("boom ");
}
}
@Override
public void close() throws Exception {
System.out.print("bam ");
throw new RuntimeException();
}
}
What is printed?
- A. Compilation fails.
- B. bim bam followed by an exception
- C. bim boom
- D. bim bam boom
- E. bim boom bam
Correct Answer: D 🗳️
Explanation: Only visible for Prep4sureExam 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, ArrayList<String>> authorsMap1 = new HashMap<>();
java
authorsMap1.put("FR", frenchAuthors); - C. Map<String, ? extends List<String>> authorsMap2 = new HashMap<String, ArrayList<String>> (); java authorsMap2.put("FR", frenchAuthors);
- D. Map<String, List<String>> authorsMap5 = new HashMap<String, List<String>>(); java authorsMap5.put("FR", frenchAuthors);
- E. var authorsMap3 = new HashMap<>();
java
authorsMap3.put("FR", frenchAuthors);
Correct Answer: A,D,E 🗳️
Explanation: Only visible for Prep4sureExam members. You can sign-up / login (it's free).
No help, Full refund!
Prep4sureExam confidently stands behind all its offerings by giving Unconditional "No help, Full refund" Guarantee. Since the time our operations started we have never seen people report failure in the exam after using our 1z1-830 exam braindumps. With this feedback we can assure you of the benefits that you will get from our 1z1-830 exam question and answer and the high probability of clearing the 1z1-830 exam.
We still understand the effort, time, and money you will invest in preparing for your Oracle certification 1z1-830 exam, which makes failure in the exam really painful and disappointing. Although we cannot reduce your pain and disappointment but we can certainly share with you the financial loss.
This means that if due to any reason you are not able to pass the 1z1-830 actual exam even after using our product, we will reimburse the full amount you spent on our products. you just need to mail us your score report along with your account information to address listed below within 7 days after your unqualified certificate came out.
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