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

2. 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) ABC
C) Compilation fails.
D) An exception is thrown.

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

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

4. 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 prints "Task is complete" once and throws an exception.
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" once, then exits normally.

5. Which of the following doesnotexist?

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

Solutions: