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Oracle Java SE 21 Developer Professional Sample Questions:

1. What do the following print?
java
public class DefaultAndStaticMethods {
public static void main(String[] args) {
WithStaticMethod.print();
}
}
interface WithDefaultMethod {
default void print() {
System.out.print("default");
}
}
interface WithStaticMethod extends WithDefaultMethod {
static void print() {
System.out.print("static");
}
}

A) static
B) Compilation fails
C) default
D) nothing

2. Given:
java
Integer frenchRevolution = 1789;
Object o1 = new String("1789");
Object o2 = frenchRevolution;
frenchRevolution = null;
Object o3 = o2.toString();
System.out.println(o1.equals(o3));
What is printed?

A) Compilation fails.
B) false
C) A NullPointerException is thrown.
D) true
E) A ClassCastException is thrown.

3. Given:
java
var deque = new ArrayDeque<>();
deque.add(1);
deque.add(2);
deque.add(3);
deque.add(4);
deque.add(5);
System.out.print(deque.peek() + " ");
System.out.print(deque.poll() + " ");
System.out.print(deque.pop() + " ");
System.out.print(deque.element() + " ");
What is printed?

A) 1 1 2 2
B) 1 1 1 1
C) 1 5 5 1
D) 1 1 2 3
E) 5 5 2 3

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

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

5. Which of the following java.io.Console methods doesnotexist?

A) read()
B) readPassword()
C) reader()
D) readLine(String fmt, Object... args)
E) readPassword(String fmt, Object... args)
F) readLine()

Solutions: