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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given a properties file on the classpath named Person.properties with the content:
ini
name=James
And:
java
public class Person extends ListResourceBundle {
protected Object[][] getContents() {
return new Object[][]{
{"name", "Jeanne"}
};
}
}
And:
java
public class Test {
public static void main(String[] args) {
ResourceBundle bundle = ResourceBundle.getBundle("Person");
String name = bundle.getString("name");
System.out.println(name);
}
}
What is the given program's output?

A) JamesJeanne
B) James
C) Compilation fails
D) MissingResourceException
E) Jeanne
F) JeanneJames

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

3. Which of the following doesnotexist?

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

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) PT0D
B) PT6H
C) Compilation fails
D) PT0H
E) It throws an exception

5. Which of the following methods of java.util.function.Predicate aredefault methods?

A) not(Predicate<? super T> target)
B) negate()
C) test(T t)
D) and(Predicate<? super T> other)
E) or(Predicate<? super T> other)
F) isEqual(Object targetRef)

Solutions: