threading

An example of some threads, their methods and ways to avoid problems that can be encountered when threading

extends Thread class

not the preferred way but is demoed here

implements Runnable

this means the class can stil extend another class

uses join

to make calling thread go into a waiting state until referenced thread terminates

uses interrupt

A thread can be asked, but not forced to be interuppted

uses readwrite locks

read locks can be held and used by mutliple threads concurrently, write threads cannot. Locks released in finally block

uses wait and notify

Simulates a gadget factory a supply chain and consumers of the gadgets. Uses two infinite while loops that hand control to each other depending on the state of the supply chain. Uses wait and notify to communicate between the threads