There are two main things to remember about each of these objects for ajangkenalan

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There are two main things to remember about each of these objects. First, each
of these objects has variables that keep track of what is currently going on
inside the object. For example, the coin-intake object would definitely know at
any given time how much money had been inserted into the machine.
Second, each object has a mechanism to allow other objects to communicate
with it. This process is known as messaging, and the parts of the object that
enable this process are known as methods. If you are used to programming in
other languages, methods are much the same as functions or procedures except
that they aren't just floating around in a program, they are attached to specific
objects. ajangkenalan
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