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Check Updated on: Sep 11, 2026
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- Total Questions: 85
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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Java Language Fundamentals | - Java syntax and language structure
|
| Exception Handling and Debugging | - Error handling mechanisms
|
| Concurrency and Multithreading | - Thread management
|
| Database Connectivity (JDBC) | - Database interaction
|
| Input/Output and File Handling | - NIO and file operations
|
| Core APIs | - Java standard library usage
|
| Advanced Java Features (Java SE 21) | - Modern language features
|
| Object-Oriented Programming | - Core OOP principles
|
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
List<Long> cannesFestivalfeatureFilms = LongStream.range(1, 1945)
.boxed()
.toList();
try (var executor = Executors.newVirtualThreadPerTaskExecutor()) {
cannesFestivalfeatureFilms.stream()
.limit(25)
.forEach(film -> executor.submit(() -> {
System.out.println(film);
}));
}
What is printed?
- A. Compilation fails
- B. An exception is thrown at runtime
- C. Numbers from 1 to 25 sequentially
- D. Numbers from 1 to 25 randomly
- E. Numbers from 1 to 1945 randomly
Explanation: Only visible for PassLeaderVCE 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, ? extends List<String>> authorsMap2 = new HashMap<String, ArrayList<String>> (); java authorsMap2.put("FR", frenchAuthors);
- B. var authorsMap3 = new HashMap<>();
java
authorsMap3.put("FR", frenchAuthors); - C. Map<String, List<String>> authorsMap5 = new HashMap<String, List<String>>(); java authorsMap5.put("FR", frenchAuthors);
- D. Map<String, List<String>> authorsMap4 = new HashMap<String, ArrayList<String>>(); java authorsMap4.put("FR", frenchAuthors);
- E. Map<String, ArrayList<String>> authorsMap1 = new HashMap<>();
java
authorsMap1.put("FR", frenchAuthors);
Explanation: Only visible for PassLeaderVCE members. You can sign-up / login (it's free).
Given:
java
var deque = new ArrayDeque<>();
deque.add(1);
deque.add(2);
deque.add(3);
deque.add(4);
deque.add(5);
System.out.print(deque.peek() + " ");
System.out.print(deque.poll() + " ");
System.out.print(deque.pop() + " ");
System.out.print(deque.element() + " ");
What is printed?
- A. 1 5 5 1
- B. 5 5 2 3
- C. 1 1 2 2
- D. 1 1 2 3
- E. 1 1 1 1
Explanation: Only visible for PassLeaderVCE members. You can sign-up / login (it's free).
Given:
java
Object input = 42;
String result = switch (input) {
case String s -> "It's a string with value: " + s;
case Double d -> "It's a double with value: " + d;
case Integer i -> "It's an integer with value: " + i;
};
System.out.println(result);
What is printed?
- A. Compilation fails.
- B. It's a string with value: 42
- C. null
- D. It's a double with value: 42
- E. It throws an exception at runtime.
- F. It's an integer with value: 42
Explanation: Only visible for PassLeaderVCE members. You can sign-up / login (it's free).
What do the following print?
java
public class Main {
int instanceVar = staticVar;
static int staticVar = 666;
public static void main(String args[]) {
System.out.printf("%d %d", new Main().instanceVar, staticVar);
}
static {
staticVar = 42;
}
}
- A. Compilation fails
- B. 666 42
- C. 666 666
- D. 42 42
Explanation: Only visible for PassLeaderVCE members. You can sign-up / login (it's free).
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