Flatten

Code Ape Tech Column

Aug 15, 2024 · Backend Development

Comprehensive Guide to TreeUtil: Building, Traversing, Flattening, and Sorting Tree Structures in Java

This article presents a detailed walkthrough of the TreeUtil class, demonstrating how to construct hierarchical tree structures from flat lists, define tree nodes in Java, perform generic and functional implementations of makeTree, traverse trees using pre‑order, level‑order and post‑order methods, flatten trees back to lists, and sort tree nodes recursively, all illustrated with complete code examples.