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Oracle 1z1-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Advanced Java Features (Java SE 21) | - Modern language features
|
| Java Language Fundamentals | - Java syntax and language structure
|
| Object-Oriented Programming | - Core OOP principles
|
| Database Connectivity (JDBC) | - Database interaction
|
| Concurrency and Multithreading | - Thread management
|
| Exception Handling and Debugging | - Error handling mechanisms
|
| Input/Output and File Handling | - NIO and file operations
|
| Core APIs | - Java standard library usage
|
Oracle Java SE 21 Developer Professional Sample Questions:
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, no cheese.
- B. Compilation fails.
- C. bread:Baguette, dish:Frog legs, cheese.
- D. bread:bread, dish:dish, cheese.
Correct Answer: A 🗳️
Explanation: Only visible for Prep4sures members. You can sign-up / login (it's free).
Which of the following doesnotexist?
- A. Supplier<T>
- B. They all exist.
- C. LongSupplier
- D. DoubleSupplier
- E. BiSupplier<T, U, R>
- F. BooleanSupplier
Correct Answer: E 🗳️
Explanation: Only visible for Prep4sures members. You can sign-up / login (it's free).
Given:
java
public class SpecialAddition extends Addition implements Special {
public static void main(String[] args) {
System.out.println(new SpecialAddition().add());
}
int add() {
return --foo + bar--;
}
}
class Addition {
int foo = 1;
}
interface Special {
int bar = 1;
}
What is printed?
- A. 0
- B. It throws an exception at runtime.
- C. 2
- D. Compilation fails.
- E. 1
Correct Answer: D 🗳️
Explanation: Only visible for Prep4sures 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, ArrayList<String>> authorsMap1 = new HashMap<>();
java
authorsMap1.put("FR", frenchAuthors); - B. Map<String, List<String>> authorsMap4 = new HashMap<String, ArrayList<String>>(); java authorsMap4.put("FR", frenchAuthors);
- C. Map<String, List<String>> authorsMap5 = new HashMap<String, List<String>>(); java authorsMap5.put("FR", frenchAuthors);
- D. Map<String, ? extends List<String>> authorsMap2 = new HashMap<String, ArrayList<String>> (); java authorsMap2.put("FR", frenchAuthors);
- E. var authorsMap3 = new HashMap<>();
java
authorsMap3.put("FR", frenchAuthors);
Correct Answer: B,C,E 🗳️
Explanation: Only visible for Prep4sures members. You can sign-up / login (it's free).
Given:
java
public class Test {
public static void main(String[] args) throws IOException {
Path p1 = Path.of("f1.txt");
Path p2 = Path.of("f2.txt");
Files.move(p1, p2);
Files.delete(p1);
}
}
In which case does the given program throw an exception?
- A. An exception is always thrown
- B. File f2.txt exists while file f1.txt doesn't
- C. Both files f1.txt and f2.txt exist
- D. File f1.txt exists while file f2.txt doesn't
- E. Neither files f1.txt nor f2.txt exist
Correct Answer: A 🗳️
Explanation: Only visible for Prep4sures members. You can sign-up / login (it's free).
Steven 
Emily 
Harriet 
Dick 
Kelly 
Nigel 
Charles 
Buck 
Moses 
Earl 
Yvonne 
Xavier 
Buck 
Ahern 
Burnell 
Boris 
Betty 
