Oracle 1z0-830 - Java SE 21 Developer Professional

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Oracle 1z0-830 Exam Syllabus Topics:

Oracle Java SE 21 Developer Professional Sample Questions:

1. 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) A NullPointerException is never thrown
B) Only if assertions are disabled and the input argument is null
C) Only if assertions are enabled and the input argument isn't null
D) Only if assertions are disabled and the input argument isn't null
E) Only if assertions are enabled and the input argument is null

2. Given:
java
StringBuffer us = new StringBuffer("US");
StringBuffer uk = new StringBuffer("UK");
Stream<StringBuffer> stream = Stream.of(us, uk);
String output = stream.collect(Collectors.joining("-", "=", ""));
System.out.println(output);
What is the given code fragment's output?

A) =US-UK
B) -US=UK
C) An exception is thrown.
D) US-UK
E) US=UK
F) Compilation fails.

3. What does the following code print?
java
import java.util.stream.Stream;
public class StreamReduce {
public static void main(String[] args) {
Stream<String> stream = Stream.of("J", "a", "v", "a");
System.out.print(stream.reduce(String::concat));
}
}

A) Optional[Java]
B) Java
C) Compilation fails
D) null

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

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

5. Given:
java
var frenchCities = new TreeSet<String>();
frenchCities.add("Paris");
frenchCities.add("Marseille");
frenchCities.add("Lyon");
frenchCities.add("Lille");
frenchCities.add("Toulouse");
System.out.println(frenchCities.headSet("Marseille"));
What will be printed?

A) [Lyon, Lille, Toulouse]
B) [Paris, Toulouse]
C) [Paris]
D) [Lille, Lyon]
E) Compilation fails

Solutions: