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Oracle Java SE 21 Developer Professional Sample Questions:

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

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

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

3. Which of the followingisn'ta correct way to write a string to a file?

A) java
try (BufferedWriter writer = new BufferedWriter("file.txt")) {
writer.write("Hello");
}
B) java
try (FileOutputStream outputStream = new FileOutputStream("file.txt")) { byte[] strBytes = "Hello".getBytes(); outputStream.write(strBytes);
}
C) java
Path path = Paths.get("file.txt");
byte[] strBytes = "Hello".getBytes();
Files.write(path, strBytes);
D) java
try (FileWriter writer = new FileWriter("file.txt")) {
writer.write("Hello");
}
E) None of the suggestions
F) java
try (PrintWriter printWriter = new PrintWriter("file.txt")) {
printWriter.printf("Hello %s", "James");
}

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

5. Given:
java
double amount = 42_000.00;
NumberFormat format = NumberFormat.getCompactNumberInstance(Locale.FRANCE, NumberFormat.Style.
SHORT);
System.out.println(format.format(amount));
What is the output?

A) 42000
B) 42000E
C) 42 000,00 €
D) 42 k

Solutions: