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Course Content


When we wish to commit a programmer (either ourselves or someone else) to writing a specific class method, but we only know the name of the method and not the details of how it should be implemented, we use abstract classes. For instance, consider circles, rectangles, and octagons.

A data member, abstract method, method body (non-abstract method), function Object() { [native code] }, and even the main() method can all be found in an abstract class.

Use this general syntax to declare an abstract method: method-name(parameter-list) is an abstract type. As you can see, there is no method body. Any concrete class that extends an abstract class (i.e. a class without the abstract keyword) must override all of the abstract methods of the class.

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