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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
StringBuffer us = new StringBuffer("US");
StringBuffer uk = new StringBuffer("UK");
Stream<StringBuffer> stream = Stream.of(us, uk);
String output = stream.collect(Collectors.joining("-", "=", ""));
System.out.println(output);
What is the given code fragment's output?

A) -US=UK
B) An exception is thrown.
C) Compilation fails.
D) US=UK
E) US-UK
F) =US-UK

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

3. Given:
java
List<String> frenchAuthors = new ArrayList<>();
frenchAuthors.add("Victor Hugo");
frenchAuthors.add("Gustave Flaubert");
Which compiles?

A) Map<String, List<String>> authorsMap4 = new HashMap<String, ArrayList<String>>(); java authorsMap4.put("FR", frenchAuthors);
B) Map<String, List<String>> authorsMap5 = new HashMap<String, List<String>>(); java authorsMap5.put("FR", frenchAuthors);
C) var authorsMap3 = new HashMap<>();
java
authorsMap3.put("FR", frenchAuthors);
D) Map<String, ? extends List<String>> authorsMap2 = new HashMap<String, ArrayList<String>> (); java authorsMap2.put("FR", frenchAuthors);
E) Map<String, ArrayList<String>> authorsMap1 = new HashMap<>();
java
authorsMap1.put("FR", frenchAuthors);

4. 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 throws an exception.
D) It prints all elements, including changes made during iteration.

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

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

Solutions: