Data Sharing Problem in Ticketing System

# Introduction

In this challenge, we will tackle the data sharing problem in a ticketing system. The ticket hall has multiple ticket windows and agents who can sell tickets simultaneously, resulting in shared tickets. Our goal is to use synchronized blocks of object locks to ensure data consistency and solve this problem. We will create a SellTicketsBlock class with SellThread subclasses to handle the shared tickets and print the thread name and ticket number. Let's get started and ensure the data consistency in the ticketing process!