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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given:
java
var hauteCouture = new String[]{ "Chanel", "Dior", "Louis Vuitton" };
var i = 0;
do {
System.out.print(hauteCouture[i] + " ");
} while (i++ > 0);
What is printed?

A) An ArrayIndexOutOfBoundsException is thrown at runtime.
B) Chanel
C) Compilation fails.
D) Chanel Dior Louis Vuitton

2. Given:
java
Optional o1 = Optional.empty();
Optional o2 = Optional.of(1);
Optional o3 = Stream.of(o1, o2)
.filter(Optional::isPresent)
.findAny()
.flatMap(o -> o);
System.out.println(o3.orElse(2));
What is the given code fragment's output?

A) 2
B) 1
C) Optional[1]
D) Optional.empty
E) Compilation fails
F) An exception is thrown
G) 0

3. Given:
java
import java.io.*;
class A implements Serializable {
int number = 1;
}
class B implements Serializable {
int number = 2;
}
public class Test {
public static void main(String[] args) throws Exception {
File file = new File("o.ser");
A a = new A();
var oos = new ObjectOutputStream(new FileOutputStream(file));
oos.writeObject(a);
oos.close();
var ois = new ObjectInputStream(new FileInputStream(file));
B b = (B) ois.readObject();
ois.close();
System.out.println(b.number);
}
}
What is the given program's output?

A) 2
B) 1
C) ClassCastException
D) Compilation fails
E) NotSerializableException

4. Given:
java
public class BoomBoom implements AutoCloseable {
public static void main(String[] args) {
try (BoomBoom boomBoom = new BoomBoom()) {
System.out.print("bim ");
throw new Exception();
} catch (Exception e) {
System.out.print("boom ");
}
}
@Override
public void close() throws Exception {
System.out.print("bam ");
throw new RuntimeException();
}
}
What is printed?

A) bim bam boom
B) bim boom bam
C) bim bam followed by an exception
D) bim boom
E) Compilation fails.

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

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

Solutions: