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Oracle Java SE 21 Developer Professional Sample Questions:

1. Which StringBuilder variable fails to compile?
java
public class StringBuilderInstantiations {
public static void main(String[] args) {
var stringBuilder1 = new StringBuilder();
var stringBuilder2 = new StringBuilder(10);
var stringBuilder3 = new StringBuilder("Java");
var stringBuilder4 = new StringBuilder(new char[]{'J', 'a', 'v', 'a'});
}
}

A) stringBuilder4
B) stringBuilder1
C) stringBuilder2
D) stringBuilder3
E) None of them

2. Given:
java
int post = 5;
int pre = 5;
int postResult = post++ + 10;
int preResult = ++pre + 10;
System.out.println("postResult: " + postResult +
", preResult: " + preResult +
", Final value of post: " + post +
", Final value of pre: " + pre);
What is printed?

A) postResult: 16, preResult: 15, Final value of post: 6, Final value of pre: 5
B) postResult: 16, preResult: 16, Final value of post: 6, Final value of pre: 6
C) postResult: 15, preResult: 16, Final value of post: 6, Final value of pre: 6
D) postResult: 15, preResult: 16, Final value of post: 5, Final value of pre: 6

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

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

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

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

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

Solutions: