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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Java Language Fundamentals | - Java syntax and language structure
|
| Topic 2: Exception Handling and Debugging | - Error handling mechanisms
|
| Topic 3: Object-Oriented Programming | - Core OOP principles
|
| Topic 4: Database Connectivity (JDBC) | - Database interaction
|
| Topic 5: Advanced Java Features (Java SE 21) | - Modern language features
|
| Topic 6: Core APIs | - Java standard library usage
|
| Topic 7: Concurrency and Multithreading | - Thread management
|
| Topic 8: Input/Output and File Handling | - NIO and file operations
|
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
package com.vv;
import java.time.LocalDate;
public class FetchService {
public static void main(String[] args) throws Exception {
FetchService service = new FetchService();
String ack = service.fetch();
LocalDate date = service.fetch();
System.out.println(ack + " the " + date.toString());
}
public String fetch() {
return "ok";
}
public LocalDate fetch() {
return LocalDate.now();
}
}
What will be the output?
- A. ok the 2024-07-10T07:17:45.523939600
- B. An exception is thrown
- C. ok the 2024-07-10
- D. Compilation fails
Correct Answer: D 🗳️
Explanation: Only visible for RealVCE members. You can sign-up / login (it's free).
Which of the following methods of java.util.function.Predicate aredefault methods?
- A. not(Predicate<? super T> target)
- B. and(Predicate<? super T> other)
- C. negate()
- D. or(Predicate<? super T> other)
- E. isEqual(Object targetRef)
- F. test(T t)
Correct Answer: B,C,D 🗳️
Explanation: Only visible for RealVCE members. You can sign-up / login (it's free).
Which of the following doesnotexist?
- A. DoubleSupplier
- B. They all exist.
- C. BooleanSupplier
- D. LongSupplier
- E. Supplier<T>
- F. BiSupplier<T, U, R>
Correct Answer: F 🗳️
Explanation: Only visible for RealVCE 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. Neither files f1.txt nor f2.txt exist
- B. File f1.txt exists while file f2.txt doesn't
- C. File f2.txt exists while file f1.txt doesn't
- D. Both files f1.txt and f2.txt exist
- E. An exception is always thrown
Correct Answer: E 🗳️
Explanation: Only visible for RealVCE members. You can sign-up / login (it's free).
Given:
java
ExecutorService service = Executors.newFixedThreadPool(2);
Runnable task = () -> System.out.println("Task is complete");
service.submit(task);
service.shutdown();
service.submit(task);
What happens when executing the given code fragment?
- A. It prints "Task is complete" twice, then exits normally.
- B. It prints "Task is complete" twice and throws an exception.
- C. It prints "Task is complete" once, then exits normally.
- D. It prints "Task is complete" once and throws an exception.
- E. It exits normally without printing anything to the console.
Correct Answer: D 🗳️
Explanation: Only visible for RealVCE members. You can sign-up / login (it's free).
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