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Oracle Java SE 21 Developer Professional Sample Questions:

1. Which methods compile?

A) ```java public List<? super IOException> getListSuper() { return new ArrayList<Exception>(); } csharp
B) ```java
public List<? super IOException> getListSuper() {
return new ArrayList<FileNotFoundException>();
}
C) ```java public List<? extends IOException> getListExtends() { return new ArrayList<Exception>(); } csharp
D) ```java
public List<? extends IOException> getListExtends() {
return new ArrayList<FileNotFoundException>();
}

2. You are working on a module named perfumery.shop that depends on another module named perfumery.
provider.
The perfumery.shop module should also make its package perfumery.shop.eaudeparfum available to other modules.
Which of the following is the correct file to declare the perfumery.shop module?

A) File name: module-info.java
java
module perfumery.shop {
requires perfumery.provider;
exports perfumery.shop.eaudeparfum;
}
B) File name: module-info.perfumery.shop.java
java
module perfumery.shop {
requires perfumery.provider;
exports perfumery.shop.eaudeparfum.*;
}
C) File name: module.java
java
module shop.perfumery {
requires perfumery.provider;
exports perfumery.shop.eaudeparfum;
}

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

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

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

5. Given:
java
List<Long> cannesFestivalfeatureFilms = LongStream.range(1, 1945)
.boxed()
.toList();
try (var executor = Executors.newVirtualThreadPerTaskExecutor()) {
cannesFestivalfeatureFilms.stream()
.limit(25)
.forEach(film -> executor.submit(() -> {
System.out.println(film);
}));
}
What is printed?

A) An exception is thrown at runtime
B) Numbers from 1 to 25 sequentially
C) Compilation fails
D) Numbers from 1 to 25 randomly
E) Numbers from 1 to 1945 randomly

Solutions: