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Oracle Java SE 21 Developer Professional Sample Questions:

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

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

3. Given:
java
Stream<String> strings = Stream.of("United", "States");
BinaryOperator<String> operator = (s1, s2) -> s1.concat(s2.toUpperCase()); String result = strings.reduce("-", operator); System.out.println(result); What is the output of this code fragment?

A) UNITED-STATES
B) -UnitedSTATES
C) -UnitedStates
D) United-STATES
E) -UNITEDSTATES
F) United-States
G) UnitedStates

4. Given:
java
Optional o1 = Optional.empty();
Optional o2 = Optional.of(1);
Optional o3 = Stream.of(o1, o2)
.filter(Optional::isPresent)
.findAny()
.flatMap(o -> o);
System.out.println(o3.orElse(2));
What is the given code fragment's output?

A) An exception is thrown
B) Compilation fails
C) 1
D) Optional[1]
E) Optional.empty
F) 2
G) 0

5. Given:
java
Map<String, Integer> map = Map.of("b", 1, "a", 3, "c", 2);
TreeMap<String, Integer> treeMap = new TreeMap<>(map);
System.out.println(treeMap);
What is the output of the given code fragment?

A) {c=2, a=3, b=1}
B) Compilation fails
C) {b=1, c=2, a=3}
D) {a=1, b=2, c=3}
E) {c=1, b=2, a=3}
F) {b=1, a=3, c=2}
G) {a=3, b=1, c=2}

Solutions: