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Oracle Java SE 21 Developer Professional Sample Questions:

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

2. Given:
java
Period p = Period.between(
LocalDate.of(2023, Month.MAY, 4),
LocalDate.of(2024, Month.MAY, 4));
System.out.println(p);
Duration d = Duration.between(
LocalDate.of(2023, Month.MAY, 4),
LocalDate.of(2024, Month.MAY, 4));
System.out.println(d);
What is the output?

A) P1Y
UnsupportedTemporalTypeException
B) P1Y
PT8784H
C) UnsupportedTemporalTypeException
D) PT8784H
P1Y

3. Which of the following doesnotexist?

A) DoubleSupplier
B) LongSupplier
C) BiSupplier<T, U, R>
D) BooleanSupplier
E) Supplier<T>
F) They all exist.

4. Given:
java
LocalDate localDate = LocalDate.of(2020, 8, 8);
Date date = java.sql.Date.valueOf(localDate);
DateFormat formatter = new SimpleDateFormat(/* pattern */);
String output = formatter.format(date);
System.out.println(output);
It's known that the given code prints out "August 08".
Which of the following should be inserted as the pattern?

A) MM dd
B) MMM dd
C) MM d
D) MMMM dd

5. 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) 1
B) ClassCastException
C) 2
D) Compilation fails
E) NotSerializableException

Solutions: