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Oracle 1z1-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Advanced Java Features (Java SE 21) | - Modern language features
|
| Core APIs | - Java standard library usage
|
| Input/Output and File Handling | - NIO and file operations
|
| Exception Handling and Debugging | - Error handling mechanisms
|
| Java Language Fundamentals | - Java syntax and language structure
|
| Concurrency and Multithreading | - Thread management
|
| Database Connectivity (JDBC) | - Database interaction
|
| Object-Oriented Programming | - Core OOP principles
|
Oracle Java SE 21 Developer Professional Sample Questions:
Given:
java
Object myVar = 0;
String print = switch (myVar) {
case int i -> "integer";
case long l -> "long";
case String s -> "string";
default -> "";
};
System.out.println(print);
What is printed?
- A. integer
- B. string
- C. nothing
- D. Compilation fails.
- E. long
- F. It throws an exception at runtime.
Explanation: Only visible for DumpsMaterials members. You can sign-up / login (it's free).
Given:
java
var now = LocalDate.now();
var format1 = new DateTimeFormatter(ISO_WEEK_DATE);
var format2 = DateTimeFormatter.ISO_WEEK_DATE;
var format3 = new DateFormat(WEEK_OF_YEAR_FIELD);
var format4 = DateFormat.getDateInstance(WEEK_OF_YEAR_FIELD);
System.out.println(now.format(REPLACE_HERE));
Which variable prints 2025-W01-2 (present-day is 12/31/2024)?
- A. format4
- B. format2
- C. format3
- D. format1
Explanation: Only visible for DumpsMaterials 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. Chanel Dior Louis Vuitton
- C. Compilation fails.
- D. An ArrayIndexOutOfBoundsException is thrown at runtime.
Explanation: Only visible for DumpsMaterials members. You can sign-up / login (it's free).
Given:
java
List<Integer> integers = List.of(0, 1, 2);
integers.stream()
.peek(System.out::print)
.limit(2)
.forEach(i -> {});
What is the output of the given code fragment?
- A. 012
- B. 01
- C. Nothing
- D. An exception is thrown
- E. Compilation fails
Explanation: Only visible for DumpsMaterials members. You can sign-up / login (it's free).
Which of the following suggestions compile?(Choose two.)
- A. java
public sealed class Figure
permits Circle, Rectangle {}
final class Circle extends Figure {
float radius;
}
non-sealed class Rectangle extends Figure {
float length, width;
} - B. java
sealed class Figure permits Rectangle {}
final class Rectangle extends Figure {
float length, width;
} - C. java
sealed class Figure permits Rectangle {}
public class Rectangle extends Figure {
float length, width;
} - D. 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;
}
Explanation: Only visible for DumpsMaterials members. You can sign-up / login (it's free).
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Upton 
Silvester 
Dylan 
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Julius 
Phoebe 
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Valerie 
Xenia 
Fabian 
Lee 
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Viola 
