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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Java I/O and NIO | - Read and write files - Process file system resources - Use Path, Files, and related APIs |
| Topic 2: Object-Oriented Programming | - Create and use classes, interfaces, enums, and records - Implement encapsulation and abstraction - Apply inheritance and polymorphism |
| Topic 3: Java Concurrency | - Use virtual threads - Create and manage threads - Work with concurrent collections and executors |
| Topic 4: Annotations and JDBC | - Use built-in and custom annotations - Connect to databases using JDBC - Execute SQL operations and process results |
| Topic 5: Controlling Program Flow | - Use switch expressions and pattern matching - Apply decision statements and loops - Work with records and sealed classes |
| Topic 6: Handling Date, Time, Text, Numeric and Boolean Values | - Work with primitive wrappers and number formatting - Use String, StringBuilder, and related APIs - Use date, time, duration, period, and localization APIs |
| Topic 7: Collections and Generics | - Use sequenced collections and maps - Use List, Set, Map, Queue, and Deque implementations - Apply generics and bounded types |
| Topic 8: Functional Programming | - Use lambda expressions and method references - Work with functional interfaces - Process data using Stream API |
| Topic 9: Exception Handling | - Handle checked and unchecked exceptions - Create custom exceptions - Use try-with-resources |
| Topic 10: Modules and Packaging | - Package and deploy applications - Manage dependencies and exports - Create and use Java modules |
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
Period p = Period.between(
LocalDate.of(2023, Month.MAY, 4),
LocalDate.of(2024, Month.MAY, 4));
System.out.println(p);
Duration d = Duration.between(
LocalDate.of(2023, Month.MAY, 4),
LocalDate.of(2024, Month.MAY, 4));
System.out.println(d);
What is the output?
- A. PT8784H
P1Y - B. P1Y
PT8784H - C. UnsupportedTemporalTypeException
- D. P1Y
UnsupportedTemporalTypeException
Correct Answer: D 🗳️
Explanation: Only visible for PassTestking 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 randomly
- B. Compilation fails
- C. Numbers from 1 to 1945 randomly
- D. An exception is thrown at runtime
- E. Numbers from 1 to 25 sequentially
Correct Answer: A 🗳️
Explanation: Only visible for PassTestking members. You can sign-up / login (it's free).
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 prints all elements, including changes made during iteration.
- B. It prints all elements, but changes made during iteration may not be visible.
- C. Compilation fails.
- D. It throws an exception.
Correct Answer: B 🗳️
Explanation: Only visible for PassTestking members. You can sign-up / login (it's free).
Which of the following isn't a valid option of the jdeps command?
- A. --print-module-deps
- B. --generate-open-module
- C. --check-deps
- D. --list-deps
- E. --generate-module-info
- F. --list-reduced-deps
Correct Answer: C 🗳️
Explanation: Only visible for PassTestking members. You can sign-up / login (it's free).
Given:
java
Optional<String> optionalName = Optional.ofNullable(null);
String bread = optionalName.orElse("Baguette");
System.out.print("bread:" + bread);
String dish = optionalName.orElseGet(() -> "Frog legs");
System.out.print(", dish:" + dish);
try {
String cheese = optionalName.orElseThrow(() -> new Exception());
System.out.println(", cheese:" + cheese);
} catch (Exception exc) {
System.out.println(", no cheese.");
}
What is printed?
- A. bread:Baguette, dish:Frog legs, cheese.
- B. Compilation fails.
- C. bread:bread, dish:dish, cheese.
- D. bread:Baguette, dish:Frog legs, no cheese.
Correct Answer: D 🗳️
Explanation: Only visible for PassTestking members. You can sign-up / login (it's free).
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