multithreading - How to create Java Thread -

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I need to create a Point of Sale application. It has two squares one POS and other bills .

POS class bill class & amp; Bill class handles all the arguments to calculate the final bill.

There is a requirement that I do not understand

An example of class should start the bill POS .

  1. Interface must be bill bill = pos.createBill () .

    <<> code.photoBill () The call should return a new example of the bill class.

  2. Bill will be used only in a thread that it was created.

    I do not know which class should apply the thread and how should I call

    POS should use Altton

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