How to Build linear structure from tree structure?

Question

How to Build hierarchy of employees when on The begining I have Their tree structure. Each employer have list of his subordinate.
https://code.sololearn.com/c6P1iKEh2A1M/?ref=app

Answer 1

First you need to think about the relation between employer and subordinate to design your application. This will help you to get started:
https://www.geeksforgeeks.org/association-composition-aggregation-java/