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Oracle Java SE 21 Developer Professional Sample Questions:

1. 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) Compilation fails.
B) An exception is thrown.
C) abc
D) ABC

2. Given:
java
CopyOnWriteArrayList<String> list = new CopyOnWriteArrayList<>();
list.add("A");
list.add("B");
list.add("C");
// Writing in one thread
new Thread(() -> {
list.add("D");
System.out.println("Element added: D");
}).start();
// Reading in another thread
new Thread(() -> {
for (String element : list) {
System.out.println("Read element: " + element);
}
}).start();
What is printed?

A) Compilation fails.
B) It prints all elements, but changes made during iteration may not be visible.
C) It prints all elements, including changes made during iteration.
D) It throws an exception.

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

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

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

5. Which of the following can be the body of a lambda expression?

A) An expression and a statement
B) Two statements
C) A statement block
D) Two expressions
E) None of the above

Solutions: