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

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

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

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

4. Given:
java
DoubleSummaryStatistics stats1 = new DoubleSummaryStatistics();
stats1.accept(4.5);
stats1.accept(6.0);
DoubleSummaryStatistics stats2 = new DoubleSummaryStatistics();
stats2.accept(3.0);
stats2.accept(8.5);
stats1.combine(stats2);
System.out.println("Sum: " + stats1.getSum() + ", Max: " + stats1.getMax() + ", Avg: " + stats1.getAverage()); What is printed?

A) An exception is thrown at runtime.
B) Compilation fails.
C) Sum: 22.0, Max: 8.5, Avg: 5.0
D) Sum: 22.0, Max: 8.5, Avg: 5.5

5. Given:
java
var counter = 0;
do {
System.out.print(counter + " ");
} while (++counter < 3);
What is printed?

A) 0 1 2 3
B) 1 2 3 4
C) Compilation fails.
D) An exception is thrown.
E) 1 2 3
F) 0 1 2

Solutions: