Let us put all these examples together. We have a Rectangle class that defines data properties and methods like findArea and findPerimeter. These methods calculate and return the area and perimeter of the rectangle, respectively. With this class, we can create a Rectangle object and reference it with an object reference. We can then send a message to the object to perform actions like finding the area or perimeter. For example, r.findArea() calculates and returns the area of the Rectangle...
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