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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
var deque = new ArrayDeque<>();
deque.add(1);
deque.add(2);
deque.add(3);
deque.add(4);
deque.add(5);
System.out.print(deque.peek() + " ");
System.out.print(deque.poll() + " ");
System.out.print(deque.pop() + " ");
System.out.print(deque.element() + " ");
What is printed?

A) 1 5 5 1
B) 1 1 2 2
C) 1 1 1 1
D) 5 5 2 3
E) 1 1 2 3

2. Given:
java
double amount = 42_000.00;
NumberFormat format = NumberFormat.getCompactNumberInstance(Locale.FRANCE, NumberFormat.Style.
SHORT);
System.out.println(format.format(amount));
What is the output?

A) 42 k
B) 42 000,00 €
C) 42000E
D) 42000

3. Given:
java
System.out.print(Boolean.logicalAnd(1 == 1, 2 < 1));
System.out.print(Boolean.logicalOr(1 == 1, 2 < 1));
System.out.print(Boolean.logicalXor(1 == 1, 2 < 1));
What is printed?

A) Compilation fails
B) truefalsetrue
C) truetruetrue
D) truetruefalse
E) falsetruetrue

4. Given:
java
void verifyNotNull(Object input) {
boolean enabled = false;
assert enabled = true;
assert enabled;
System.out.println(input.toString());
assert input != null;
}
When does the given method throw a NullPointerException?

A) Only if assertions are enabled and the input argument isn't null
B) Only if assertions are disabled and the input argument is null
C) Only if assertions are disabled and the input argument isn't null
D) A NullPointerException is never thrown
E) Only if assertions are enabled and the input argument is null

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

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

Solutions: