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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

Question 1

Which three of the following are correct about the Java module system?

A. If a request is made to load a type whose package is not defined in any known module, then the module system will attempt to load it from the classpath.
B. If a package is defined in both a named module and the unnamed module, then the package in the unnamed module is ignored.
C. We must add a module descriptor to make an application developed using a Java version prior to SE9 run on Java 11.
D. The unnamed module can only access packages defined in the unnamed module.
E. The unnamed module exports all of its packages.
F. Code in an explicitly named module can access types in the unnamed module.

Question 2

Given:
java
final Stream<String> strings =
Files.readAllLines(Paths.get("orders.csv"));
strings.skip(1)
.limit(2)
.forEach(System.out::println);
And that the orders.csv file contains:
mathematica
OrderID,Customer,Product,Quantity,Price
1,Kylian Mbappe,Keyboard,2,25.50
2,Teddy Riner,Mouse,1,15.99
3,Sebastien Loeb,Monitor,1,199.99
4,Antoine Griezmann,Headset,3,45.00
What is printed?

A. arduino
1,Kylian Mbappe,Keyboard,2,25.50
2,Teddy Riner,Mouse,1,15.99
3,Sebastien Loeb,Monitor,1,199.99
4,Antoine Griezmann,Headset,3,45.00
B. Compilation fails.
C. An exception is thrown at runtime.
D. arduino
1,Kylian Mbappe,Keyboard,2,25.50
2,Teddy Riner,Mouse,1,15.99
E. arduino
2,Teddy Riner,Mouse,1,15.99
3,Sebastien Loeb,Monitor,1,199.99

Question 3

A module com.eiffeltower.shop with the related sources in the src directory.
That module requires com.eiffeltower.membership, available in a JAR located in the lib directory.
What is the command to compile the module com.eiffeltower.shop?

A. css
CopyEdit
javac --module-source-path src -p lib/com.eiffel.membership.jar -s out -m com.eiffeltower.shop
B. css
CopyEdit
javac -path src -p lib/com.eiffel.membership.jar -d out -m com.eiffeltower.shop
C. bash
CopyEdit
javac -source src -p lib/com.eiffel.membership.jar -d out -m com.eiffeltower.shop
D. css
CopyEdit
javac --module-source-path src -p lib/com.eiffel.membership.jar -d out -m com.eiffeltower.shop

Question 4

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, cheese.
B. bread:Baguette, dish:Frog legs, no cheese.
C. Compilation fails.
D. bread:bread, dish:dish, cheese.

Question 5

Which of the following statements is correct about a final class?

A. It cannot be extended by any other class.
B. It must contain at least a final method.
C. The final keyword in its declaration must go right before the class keyword.
D. It cannot extend another class.
E. It cannot implement any interface.

Solutions: