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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Object-Oriented Programming | - Core OOP principles
|
| Java Language Fundamentals | - Java syntax and language structure
|
| Input/Output and File Handling | - NIO and file operations
|
| Exception Handling and Debugging | - Error handling mechanisms
|
| Core APIs | - Java standard library usage
|
| Concurrency and Multithreading | - Thread management
|
| Database Connectivity (JDBC) | - Database interaction
|
| Advanced Java Features (Java SE 21) | - Modern language features
|
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
double amount = 42_000.00;
NumberFormat format = NumberFormat.getCompactNumberInstance(Locale.FRANCE, NumberFormat.Style.
SHORT);
System.out.println(format.format(amount));
What is the output?
- A. 42 k
- B. 42 000,00 €
- C. 42000
- D. 42000E
Correct Answer: A 🗳️
Explanation: Only visible for Lead2PassExam members. You can sign-up / login (it's free).
Given:
java
var counter = 0;
do {
System.out.print(counter + " ");
} while (++counter < 3);
What is printed?
- A. 0 1 2 3
- B. An exception is thrown.
- C. Compilation fails.
- D. 1 2 3
- E. 1 2 3 4
- F. 0 1 2
Correct Answer: F 🗳️
Explanation: Only visible for Lead2PassExam 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. 1 1 2 3
- C. 1 1 2 2
- D. 1 1 1 1
- E. 5 5 2 3
Correct Answer: B 🗳️
Explanation: Only visible for Lead2PassExam members. You can sign-up / login (it's free).
Given:
java
var _ = 3;
var $ = 7;
System.out.println(_ + $);
What is printed?
- A. _$
- B. Compilation fails.
- C. 10
- D. It throws an exception.
Correct Answer: B 🗳️
Explanation: Only visible for Lead2PassExam members. You can sign-up / login (it's free).
Given:
java
public class ThisCalls {
public ThisCalls() {
this(true);
}
public ThisCalls(boolean flag) {
this();
}
}
Which statement is correct?
- A. It does not compile.
- B. It throws an exception at runtime.
- C. It compiles.
Correct Answer: A 🗳️
Explanation: Only visible for Lead2PassExam members. You can sign-up / login (it's free).
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