When we consider a Java program it can be defined as a collection of objects
that communicate via invoking each other's methods. Let us now briefly look
into what do class, object, methods and instance variables mean.
Instance
Variables -
Each object has its unique set of instance variables. An object's state is
created by the values assigned to these instance variables.
·
Object - Objects have states and behaviors.
Example: A dog has states - color, name, breed as well as behaviors -wagging,
barking, eating. An object is an instance of a class.
·
Class - A class can be defined as a
template/ blue print that describes the behaviors/states that object of its
type support.
·
Methods - A method is basically a
behavior. Java class can contain many methods. It is in methods where the logics
are written, data is manipulated and all the actions are executed.
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