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Oracle Java SE 21 Developer Professional Sample Questions:

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

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

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

3. Given:
java
try (FileOutputStream fos = new FileOutputStream("t.tmp");
ObjectOutputStream oos = new ObjectOutputStream(fos)) {
fos.write("Today");
fos.writeObject("Today");
oos.write("Today");
oos.writeObject("Today");
} catch (Exception ex) {
// handle exception
}
Which statement compiles?

A) fos.writeObject("Today");
B) oos.writeObject("Today");
C) oos.write("Today");
D) fos.write("Today");

4. Which of the following statements oflocal variables declared with varareinvalid?(Choose 4)

A) var b = 2, c = 3.0;
B) var f = { 6 };
C) var d[] = new int[4];
D) var a = 1;(Valid: var correctly infers int)
E) var h = (g = 7);
F) var e;

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

Solutions: