Oracle 1z1-830 : Java SE 21 Developer Professional

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

2. Given:
java
public class Test {
public static void main(String[] args) throws IOException {
Path p1 = Path.of("f1.txt");
Path p2 = Path.of("f2.txt");
Files.move(p1, p2);
Files.delete(p1);
}
}
In which case does the given program throw an exception?

A) Both files f1.txt and f2.txt exist
B) File f1.txt exists while file f2.txt doesn't
C) File f2.txt exists while file f1.txt doesn't
D) Neither files f1.txt nor f2.txt exist
E) An exception is always thrown

3. How would you create a ConcurrentHashMap configured to allow a maximum of 10 concurrent writer threads and an initial capacity of 42?
Which of the following options meets this requirement?

A) var concurrentHashMap = new ConcurrentHashMap(42, 0.88f, 10);
B) var concurrentHashMap = new ConcurrentHashMap();
C) None of the suggestions.
D) var concurrentHashMap = new ConcurrentHashMap(42, 10);
E) var concurrentHashMap = new ConcurrentHashMap(42);

4. Given:
java
StringBuilder result = Stream.of("a", "b")
.collect(
() -> new StringBuilder("c"),
StringBuilder::append,
(a, b) -> b.append(a)
);
System.out.println(result);
What is the output of the given code fragment?

A) cacb
B) cbca
C) bac
D) bca
E) cba
F) acb
G) abc

5. Given:
java
interface A {
default void ma() {
}
}
interface B extends A {
static void mb() {
}
}
interface C extends B {
void ma();
void mc();
}
interface D extends C {
void md();
}
interface E extends D {
default void ma() {
}
default void mb() {
}
default void mc() {
}
}
Which interface can be the target of a lambda expression?

A) A
B) B
C) D
D) C
E) E
F) None of the above

Solutions: