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Oracle 1z1-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Exception Handling and Debugging | - Error handling mechanisms
|
| Object-Oriented Programming | - Core OOP principles
|
| Concurrency and Multithreading | - Thread management
|
| Java Language Fundamentals | - Java syntax and language structure
|
| Database Connectivity (JDBC) | - Database interaction
|
| Core APIs | - Java standard library usage
|
| Advanced Java Features (Java SE 21) | - Modern language features
|
| Input/Output and File Handling | - NIO and file operations
|
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
DoubleStream doubleStream = DoubleStream.of(3.3, 4, 5.25, 6.66);
Predicate<Double> doublePredicate = d -> d < 5;
System.out.println(doubleStream.anyMatch(doublePredicate));
What is printed?
- A. true
- B. An exception is thrown at runtime
- C. 3.3
- D. false
- E. Compilation fails
Correct Answer: E 🗳️
Explanation: Only visible for Pass4sures members. You can sign-up / login (it's free).
Which of the following suggestions compile?(Choose two.)
- A. java
sealed class Figure permits Rectangle {}
public class Rectangle extends Figure {
float length, width;
} - B. java
public sealed class Figure
permits Circle, Rectangle {}
final class Circle extends Figure {
float radius;
}
non-sealed class Rectangle extends Figure {
float length, width;
} - C. java
public sealed class Figure
permits Circle, Rectangle {}
final sealed class Circle extends Figure {
float radius;
}
non-sealed class Rectangle extends Figure {
float length, width;
} - D. java
sealed class Figure permits Rectangle {}
final class Rectangle extends Figure {
float length, width;
}
Correct Answer: B,D 🗳️
Explanation: Only visible for Pass4sures members. You can sign-up / login (it's free).
Given:
java
var hauteCouture = new String[]{ "Chanel", "Dior", "Louis Vuitton" };
var i = 0;
do {
System.out.print(hauteCouture[i] + " ");
} while (i++ > 0);
What is printed?
- A. Chanel
- B. An ArrayIndexOutOfBoundsException is thrown at runtime.
- C. Compilation fails.
- D. Chanel Dior Louis Vuitton
Correct Answer: A 🗳️
Explanation: Only visible for Pass4sures members. You can sign-up / login (it's free).
Given:
java
var _ = 3;
var $ = 7;
System.out.println(_ + $);
What is printed?
- A. It throws an exception.
- B. _$
- C. Compilation fails.
- D. 10
Correct Answer: C 🗳️
Explanation: Only visible for Pass4sures members. You can sign-up / login (it's free).
Which of the following can be the body of a lambda expression?
- A. An expression and a statement
- B. Two expressions
- C. None of the above
- D. Two statements
- E. A statement block
Correct Answer: E 🗳️
Explanation: Only visible for Pass4sures members. You can sign-up / login (it's free).
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