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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
public class BoomBoom implements AutoCloseable {
public static void main(String[] args) {
try (BoomBoom boomBoom = new BoomBoom()) {
System.out.print("bim ");
throw new Exception();
} catch (Exception e) {
System.out.print("boom ");
}
}
@Override
public void close() throws Exception {
System.out.print("bam ");
throw new RuntimeException();
}
}
What is printed?

A) bim boom bam
B) bim bam followed by an exception
C) Compilation fails.
D) bim bam boom
E) bim boom

2. Given:
java
public class Test {
public static void main(String[] args) throws IOException {
Path p1 = Path.of("f1.txt");
Path p2 = Path.of("f2.txt");
Files.move(p1, p2);
Files.delete(p1);
}
}
In which case does the given program throw an exception?

A) Neither files f1.txt nor f2.txt exist
B) Both files f1.txt and f2.txt exist
C) An exception is always thrown
D) File f2.txt exists while file f1.txt doesn't
E) File f1.txt exists while file f2.txt doesn't

3. Given:
java
Deque<Integer> deque = new ArrayDeque<>();
deque.offer(1);
deque.offer(2);
var i1 = deque.peek();
var i2 = deque.poll();
var i3 = deque.peek();
System.out.println(i1 + " " + i2 + " " + i3);
What is the output of the given code fragment?

A) 2 2 1
B) 2 1 1
C) 2 1 2
D) 1 1 1
E) 2 2 2
F) An exception is thrown.
G) 1 2 2
H) 1 1 2
I) 1 2 1

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

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

Solutions: