Overview

The problem at hand is ensuring the ordered execution of methods across different threads. Essentially, we have three methods: first(), second(), and third(). The objective is to guarantee that irrespective of the order in the threads are triggered or scheduled, first() must execute before second(), and second() must execute before third().

In concurrent programming, it's challenging to ensure the execution order because the operating system can schedule threads in any sequence. This means even if you start thread A (that calls `first()