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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

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

2. Given:
java
public class SpecialAddition extends Addition implements Special {
public static void main(String[] args) {
System.out.println(new SpecialAddition().add());
}
int add() {
return --foo + bar--;
}
}
class Addition {
int foo = 1;
}
interface Special {
int bar = 1;
}
What is printed?

A) 1
B) 0
C) 2
D) Compilation fails.
E) It throws an exception at runtime.

3. 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" once and throws an exception.
B) It prints "Task is complete" twice, then exits normally.
C) It prints "Task is complete" twice and throws an exception.
D) It prints "Task is complete" once, then exits normally.
E) It exits normally without printing anything to the console.

4. Which two of the following aren't the correct ways to create a Stream?

A) Stream stream = Stream.ofNullable("a");
B) Stream<String> stream = Stream.builder().add("a").build();
C) Stream stream = Stream.generate(() -> "a");
D) Stream stream = new Stream();
E) Stream stream = Stream.of("a");
F) Stream stream = Stream.of();
G) Stream stream = Stream.empty();

5. Which of the following isn't a valid option of the jdeps command?

A) --check-deps
B) --print-module-deps
C) --list-deps
D) --list-reduced-deps
E) --generate-open-module
F) --generate-module-info

Solutions: