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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Consider the following methods to load an implementation of MyService using ServiceLoader. Which of the methods are correct? (Choose all that apply)

A) MyService service = ServiceLoader.load(MyService.class).findFirst().get();
B) MyService service = ServiceLoader.getService(MyService.class);
C) MyService service = ServiceLoader.services(MyService.class).getFirstInstance();
D) MyService service = ServiceLoader.load(MyService.class).iterator().next();

2. Given:
var cabarets = new TreeMap<>();
cabarets.put(1, "Moulin Rouge");
cabarets.put(2, "Crazy Horse");
cabarets.put(3, "Paradis Latin");
cabarets.put(4, "Le Lido");
cabarets.put(5, "Folies Bergere");
System.out.println(cabarets.subMap(2, true, 5, false));
What is printed?

A) An exception is thrown at runtime.
B) {2=Crazy Horse, 3=Paradis Latin, 4=Le Lido}
C) {}
D) Compilation fails.
E) CopyEdit{2=Crazy Horse, 3=Paradis Latin, 4=Le Lido, 5=Folies Bergere}

3. Given:
java
interface SmartPhone {
boolean ring();
}
class Iphone15 implements SmartPhone {
boolean isRinging;
boolean ring() {
isRinging = !isRinging;
return isRinging;
}
}
Choose the right statement.

A) Iphone15 class does not compile
B) An exception is thrown at running Iphone15.ring();
C) Everything compiles
D) SmartPhone interface does not compile

4. Given:
java
Deque<Integer> deque = new ArrayDeque<>();
deque.offer(1);
deque.offer(2);
var i1 = deque.peek();
var i2 = deque.poll();
var i3 = deque.peek();
System.out.println(i1 + " " + i2 + " " + i3);
What is the output of the given code fragment?

A) 1 2 2
B) 1 1 2
C) 2 1 2
D) 1 1 1
E) 2 2 2
F) An exception is thrown.
G) 2 1 1
H) 1 2 1
I) 2 2 1

5. 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 is null
B) Only if assertions are enabled and the input argument isn't 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 disabled and the input argument is null

Solutions: