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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
Optional<String> optionalName = Optional.ofNullable(null);
String bread = optionalName.orElse("Baguette");
System.out.print("bread:" + bread);
String dish = optionalName.orElseGet(() -> "Frog legs");
System.out.print(", dish:" + dish);
try {
String cheese = optionalName.orElseThrow(() -> new Exception());
System.out.println(", cheese:" + cheese);
} catch (Exception exc) {
System.out.println(", no cheese.");
}
What is printed?

A) bread:Baguette, dish:Frog legs, cheese.
B) Compilation fails.
C) bread:Baguette, dish:Frog legs, no cheese.
D) bread:bread, dish:dish, cheese.

2. 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.of();
C) Stream stream = Stream.empty();
D) Stream stream = new Stream();
E) Stream stream = Stream.of("a");
F) Stream stream = Stream.ofNullable("a");
G) Stream stream = Stream.generate(() -> "a");

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

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) PT0H
C) PT0D
D) It throws an exception
E) PT6H

5. Given:
java
Deque<Integer> deque = new ArrayDeque<>();
deque.offer(1);
deque.offer(2);
var i1 = deque.peek();
var i2 = deque.poll();
var i3 = deque.peek();
System.out.println(i1 + " " + i2 + " " + i3);
What is the output of the given code fragment?

A) 1 2 1
B) 2 1 1
C) 1 1 2
D) 2 1 2
E) 2 2 1
F) 2 2 2
G) 1 2 2
H) 1 1 1
I) An exception is thrown.

Solutions: