/*** If a value is present, apply the provided mapping function to it,
public Optional map(Function super T, ? extends U>mapper) {
Objects.requireNonNull(mapper);if (!isPresent())returnempty();else{returnOptional.ofNullable(mapper.apply(value));
}
}
/*** If a value is present, apply the provided mapping function to it,
public Optional map(Function super T, ? extends U>mapper) {
Objects.requireNonNull(mapper);if (!isPresent())returnempty();else{returnOptional.ofNullable(mapper.apply(value));
}
}
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