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Oracle 1z0-830 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) negate()
B) or(Predicate<? super T> other)
C) not(Predicate<? super T> target)
D) isEqual(Object targetRef)
E) and(Predicate<? super T> other)
F) test(T t)

2. Given:
java
int post = 5;
int pre = 5;
int postResult = post++ + 10;
int preResult = ++pre + 10;
System.out.println("postResult: " + postResult +
", preResult: " + preResult +
", Final value of post: " + post +
", Final value of pre: " + pre);
What is printed?

A) postResult: 15, preResult: 16, Final value of post: 5, Final value of pre: 6
B) postResult: 16, preResult: 15, Final value of post: 6, Final value of pre: 5
C) postResult: 16, preResult: 16, Final value of post: 6, Final value of pre: 6
D) postResult: 15, preResult: 16, Final value of post: 6, Final value of pre: 6

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

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

4. What do the following print?
java
import java.time.Duration;
public class DividedDuration {
public static void main(String[] args) {
var day = Duration.ofDays(2);
System.out.print(day.dividedBy(8));
}
}

A) PT6H
B) PT0H
C) Compilation fails
D) It throws an exception
E) PT0D

5. Which two of the following aren't the correct ways to create a Stream?

A) Stream<String> stream = Stream.builder().add("a").build();
B) Stream stream = Stream.generate(() -> "a");
C) Stream stream = new Stream();
D) Stream stream = Stream.of();
E) Stream stream = Stream.ofNullable("a");
F) Stream stream = Stream.of("a");
G) Stream stream = Stream.empty();

Solutions: