https://pieterjd.github.io/tags/fallback/Recent content in fallback on pieterjd.beHugo -- gohugo.ioen-usThis work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.Wed, 28 Jun 2023 16:45:31 +0200https://pieterjd.github.io/posts/fallback-mechanism-with-streams/Wed, 28 Jun 2023 16:45:31 +0200https://pieterjd.github.io/posts/fallback-mechanism-with-streams/The Problem I would like to summarize Person objects. Use the lastName if it is not null; if null, then use the firstName; else use the birthDay. If all these are null , then use the default text UNKNOWN. Usually, you write something like this: String summary = ""; if(p.getLastName() != null){ summary = p.getLastName(); } else if(p.getFirstName() != null){ summary = p.getFirstName(); } else if (p.getBirthDate() != null){ summary = p.