“abstract”: “abstract” is a keyword or modifier, which is used in the case of class and method. Purpose of “abstract” class: An “abstract” class is a class which may or may not include abstract methods and cannot be instantiated, but rather can be sub classed or it must serve as a superclass. The conditions for a class to be considered as legal “abstract” class are mentioned below: If a class includes “abstract” methods, then the class must be declared as “abstract”. The “abstract” method is declared within the “abstract” class that must be declared without curly braces and followed by a semicolon. Example of an “abstract” class: The example of an “abstract” class is mentioned below: public abstract class GraphicRectangle { // declare fields // declare non abstract methods abstract void drawRectangle(); }

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Chapter 8.4, Problem 33STQ

Program Plan Intro

“abstract”:

“abstract” is a keyword or modifier, which is used in the case of class and method.

Purpose of “abstract” class:

An “abstract” class is a class which may or may not include abstract methods and cannot be instantiated, but rather can be sub classed or it must serve as a superclass.

The conditions for a class to be considered as legal “abstract” class are mentioned below:

If a class includes “abstract” methods, then the class must be declared as “abstract”.

The “abstract” method is declared within the “abstract” class that must be declared without curly braces and followed by a semicolon.

Example of an “abstract” class:

The example of an “abstract” class is mentioned below:

public abstract class GraphicRectangle {

// declare fields

// declare non abstract methods

abstract void drawRectangle();

}

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