Do not return null in java development

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Do not return null

Counterexample

Positive example

Avoid unnecessary null pointers when calling methods elsewhere

Optional null judgment

/ / get the subdirectory list public List getChild (String pid) {if (V.isEmpty (pid)) {pid = BasicDic.TEMPORARY_DIRECTORY_ROOT;} CatalogueTreeNode node = treeNodeMap.get (pid); return Optional.ofNullable (node) .map (CatalogueTreeNode::getChild) .orElse (Collections.emptyList ());} Thank you for reading! This is the end of this article on "do not return null in java development". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, you can share it for more people to see!