StringBuilder append() and null values

Question

I have a list of Strings, and I want to concatenate them with spaces in between. So I\'m using StringBuilder. Now if any of the Strings ar

Answer 1

import java.util.Objects;
...
sb.append(Objects.toString(s, ""));

Uses Java internal utils, no external libs are needed. toString takes String, checks if it is null and if it is null, then returns specified default value, in this case "" (empty string), if it is not null it returns provided string.