Generalization and Specialization

Generalization creates a concept with a broader scope.
Specialization creates a concept with a narrower scope.

Reusing the interface!
Inheritance: get the interface from the general class.
Objects related by inheritance are all of the same type.

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Polymorphism and Dynamic Binding

Polymorphism: One piece of code works with all shape objects. Dynamic binding: How polymorphism is implemented Take previous Shape class hierarchy remove inheritance remove general and abstract class Shape

The Class Concept

A class is a collection of objects (or values) and a corresponding set of methods. A class encapsulates the data representation and makes data access possible at a higher level of abstraction. Example 1: A set of vehicles with operations for starting, stopping, driving, get km/liter, etc. Example 2: A time interval, start time, end time, duration, overlapping intervals, etc. Example 3: A string, upper case, compare, lower case, etc. str.equals(otherStr) – class/Java style strcmp(str, otherStr) – C style

JAVA

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