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Oracle 1z1-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Input/Output and File Handling | - NIO and file operations
|
| Topic 2: Concurrency and Multithreading | - Thread management
|
| Topic 3: Object-Oriented Programming | - Core OOP principles
|
| Topic 4: Advanced Java Features (Java SE 21) | - Modern language features
|
| Topic 5: Core APIs | - Java standard library usage
|
| Topic 6: Database Connectivity (JDBC) | - Database interaction
|
| Topic 7: Exception Handling and Debugging | - Error handling mechanisms
|
| Topic 8: Java Language Fundamentals | - Java syntax and language structure
|
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
CopyOnWriteArrayList<String> list = new CopyOnWriteArrayList<>();
list.add("A");
list.add("B");
list.add("C");
// Writing in one thread
new Thread(() -> {
list.add("D");
System.out.println("Element added: D");
}).start();
// Reading in another thread
new Thread(() -> {
for (String element : list) {
System.out.println("Read element: " + element);
}
}).start();
What is printed?
- A. It throws an exception.
- B. It prints all elements, but changes made during iteration may not be visible.
- C. Compilation fails.
- D. It prints all elements, including changes made during iteration.
Explanation: Only visible for PrepAwayETE members. You can sign-up / login (it's free).
Given:
java
var now = LocalDate.now();
var format1 = new DateTimeFormatter(ISO_WEEK_DATE);
var format2 = DateTimeFormatter.ISO_WEEK_DATE;
var format3 = new DateFormat(WEEK_OF_YEAR_FIELD);
var format4 = DateFormat.getDateInstance(WEEK_OF_YEAR_FIELD);
System.out.println(now.format(REPLACE_HERE));
Which variable prints 2025-W01-2 (present-day is 12/31/2024)?
- A. format4
- B. format1
- C. format3
- D. format2
Explanation: Only visible for PrepAwayETE members. You can sign-up / login (it's free).
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. oos.write("Today");
- B. fos.write("Today");
- C. fos.writeObject("Today");
- D. oos.writeObject("Today");
Explanation: Only visible for PrepAwayETE members. You can sign-up / login (it's free).
Given:
java
void verifyNotNull(Object input) {
boolean enabled = false;
assert enabled = true;
assert enabled;
System.out.println(input.toString());
assert input != null;
}
When does the given method throw a NullPointerException?
- A. Only if assertions are enabled and the input argument is null
- B. Only if assertions are enabled and the input argument isn't null
- C. Only if assertions are disabled and the input argument is null
- D. A NullPointerException is never thrown
- E. Only if assertions are disabled and the input argument isn't null
Explanation: Only visible for PrepAwayETE members. You can sign-up / login (it's free).
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. Numbers from 1 to 25 sequentially
- B. Numbers from 1 to 1945 randomly
- C. Compilation fails
- D. An exception is thrown at runtime
- E. Numbers from 1 to 25 randomly
Explanation: Only visible for PrepAwayETE members. You can sign-up / login (it's free).
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