It is useful to wrap an object inside an Optional to avoid checking for nullness. Optionals can also be used inside method chains to simplify the logic of a program.
Section 11.1: Creating an Optional
The Optional class wraps an object of type parameter T.
public final class Optional <T> {
...
}
The Optional class provides the following static methods which are used to create Optionals of type T:
static <T> Optional<T> of(T value);
static <T> Optional<T> ofNullable(T value);
static <T> Optional<T> empty();
The of method creates an Optional from a non-null argument. If called with a null ...
