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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

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

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

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

3. Given:
java
public class Versailles {
int mirrorsCount;
int gardensHectares;
void Versailles() { // n1
this.mirrorsCount = 17;
this.gardensHectares = 800;
System.out.println("Hall of Mirrors has " + mirrorsCount + " mirrors."); System.out.println("The gardens cover " + gardensHectares + " hectares.");
}
public static void main(String[] args) {
var castle = new Versailles(); // n2
}
}
What is printed?

A) An exception is thrown at runtime.
B) Compilation fails at line n2.
C) nginx
Hall of Mirrors has 17 mirrors.
The gardens cover 800 hectares.
D) Compilation fails at line n1.
E) Nothing

4. Given:
java
List<String> abc = List.of("a", "b", "c");
abc.stream()
.forEach(x -> {
x = x.toUpperCase();
});
abc.stream()
.forEach(System.out::print);
What is the output?

A) abc
B) An exception is thrown.
C) ABC
D) Compilation fails.

5. Given:
java
var counter = 0;
do {
System.out.print(counter + " ");
} while (++counter < 3);
What is printed?

A) 0 1 2
B) 1 2 3
C) An exception is thrown.
D) 1 2 3 4
E) Compilation fails.
F) 0 1 2 3

Solutions: