Using multiple map functions vs. a block statement in a map in a java stream

Question

Say I have the following code

data.stream()
    .map(x -> {
        Object a = maybeReturnsNull(x);
        return a == null ? defaultValue : a;
    })
         


        

Answer 1

java has provided a dedicated API to handle with "null".

https://docs.oracle.com/javase/8/docs/api/java/util/Optional.html