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Oracle Java SE 21 Developer Professional Sample Questions:

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

2. What do the following print?
java
import java.time.Duration;
public class DividedDuration {
public static void main(String[] args) {
var day = Duration.ofDays(2);
System.out.print(day.dividedBy(8));
}
}

A) PT0D
B) PT6H
C) Compilation fails
D) PT0H
E) It throws an exception

3. Given:
java
StringBuilder result = Stream.of("a", "b")
.collect(
() -> new StringBuilder("c"),
StringBuilder::append,
(a, b) -> b.append(a)
);
System.out.println(result);
What is the output of the given code fragment?

A) cacb
B) cbca
C) abc
D) cba
E) acb
F) bca
G) bac

4. Which of the following statements oflocal variables declared with varareinvalid?(Choose 4)

A) var d[] = new int[4];
B) var e;
C) var a = 1;(Valid: var correctly infers int)
D) var h = (g = 7);
E) var f = { 6 };
F) var b = 2, c = 3.0;

5. Given:
java
var _ = 3;
var $ = 7;
System.out.println(_ + $);
What is printed?

A) 10
B) Compilation fails.
C) It throws an exception.
D) _$

Solutions: