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Oracle 1z1-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
Object myVar = 0;
String print = switch (myVar) {
case int i -> "integer";
case long l -> "long";
case String s -> "string";
default -> "";
};
System.out.println(print);
What is printed?

A) nothing
B) long
C) integer
D) string
E) It throws an exception at runtime.
F) Compilation fails.

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

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

3. Given:
java
public class OuterClass {
String outerField = "Outer field";
class InnerClass {
void accessMembers() {
System.out.println(outerField);
}
}
public static void main(String[] args) {
System.out.println("Inner class:");
System.out.println("------------");
OuterClass outerObject = new OuterClass();
InnerClass innerObject = new InnerClass(); // n1
innerObject.accessMembers(); // n2
}
}
What is printed?

A) An exception is thrown at runtime.
B) Compilation fails at line n1.
C) Compilation fails at line n2.
D) Nothing
E) markdown
Inner class:
------------
Outer field

4. Given:
java
List<Long> cannesFestivalfeatureFilms = LongStream.range(1, 1945)
.boxed()
.toList();
try (var executor = Executors.newVirtualThreadPerTaskExecutor()) {
cannesFestivalfeatureFilms.stream()
.limit(25)
.forEach(film -> executor.submit(() -> {
System.out.println(film);
}));
}
What is printed?

A) An exception is thrown at runtime
B) Numbers from 1 to 25 randomly
C) Compilation fails
D) Numbers from 1 to 1945 randomly
E) Numbers from 1 to 25 sequentially

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

Solutions: