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Some classes, such as our hello application, have just one or more method that will be executed as a program. Only one instance of these classes is created (by the interpreter).
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| 2 |
Other classes are used to structure data, such as the previous example. Another example might be to have a class to represent type Complex. It would have
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variables to hold the real and imaginary parts of each instance
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a method called Complex to initialize those variables on creation
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methods called add, subtract, and so on to operate on each instance of the complex class.
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| 3 |
A computational class could create several instances of the class Complex and use them with the methods for arithmetic.
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| 4 |
Note an object carries a lot of "baggage" compared to a simple type. We are trying to get efficient lightweight classes into language
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