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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Which of the following methods of java.util.function.Predicate aredefault methods?

A) test(T t)
B) not(Predicate<? super T> target)
C) or(Predicate<? super T> other)
D) negate()
E) isEqual(Object targetRef)
F) and(Predicate<? super T> other)

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

3. Which of the following statements is correct about a final class?

A) It cannot be extended by any other class.
B) It cannot extend another class.
C) It must contain at least a final method.
D) It cannot implement any interface.
E) The final keyword in its declaration must go right before the class keyword.

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

5. 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();

Solutions: