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Oracle Java SE 21 Developer Professional Sample Questions:

1. Which of the following doesnotexist?

A) BiSupplier<T, U, R>
B) LongSupplier
C) BooleanSupplier
D) DoubleSupplier
E) Supplier<T>
F) They all exist.

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

3. Given:
java
Runnable task1 = () -> System.out.println("Executing Task-1");
Callable<String> task2 = () -> {
System.out.println("Executing Task-2");
return "Task-2 Finish.";
};
ExecutorService execService = Executors.newCachedThreadPool();
// INSERT CODE HERE
execService.awaitTermination(3, TimeUnit.SECONDS);
execService.shutdownNow();
Which of the following statements, inserted in the code above, printsboth:
"Executing Task-2" and "Executing Task-1"?

A) execService.run(task2);
B) execService.execute(task2);
C) execService.execute(task1);
D) execService.run(task1);
E) execService.call(task2);
F) execService.submit(task2);
G) execService.call(task1);
H) execService.submit(task1);

4. 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) An exception is thrown
B) 012
C) Nothing
D) 01
E) Compilation fails

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

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

Solutions: