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Sometimes, a class that you define represents an abstract concept and, as such, should not be the Basics, The instantiated Take, for example, food in the real world Have you ever seen an instance of food No ByMary Campione,Kathy Walrath,Alison Huml What you see instead are instances of carrot, apple, and chocolate chip cookies Food represents the abstract concept of what we can eat It doesn't make sense for an instance of food to exist
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Similarly, in December 28, 2000 Pub Date : object-oriented programming, you may want to model an abstract concept without being able to create an instance of it For example, the Number class represents the abstract concept of ISBN : 0-201-70393-9 numbers It makes sense to model numbers in a program, but it doesn't make sense to create a Pages : 592 generic number object Instead, the Number class makes sense only as a superclass to such classes as Integer and Float, both of which implement specific kinds of numbers A class such as Number, which represents an abstract concept and should not be instantiated, is called an abstract class An abstract class can only be subclassed; it cannot be instantiated "This book stands above the rest because it has been available on the web and read by thousands of Java programmers class is an have received an the keyword abstract before the class sections To declare that yourThe authorsabstract class, useenormous amount of feedback about whichkeyword are good and which sections are confusing; the confusing ones have been improved I doubt that any in your class declaration: other Java book has undergone such trial by fire" -Metroplex Java User Group, wwwjavamugorg/reviews/
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abstract class Number { Whether you're taking a class or learning on the job, The Java(TM) Tutorial, Third Edition , is a hands} guide that lets you quickly become proficient with the Java programming language Written by on
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members of the Java Software team at Sun Microsystems, the book uses an interactive approach to If you attempt the Java platformabstract class, the compiler displays an error message help you learn to instantiate an by example
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Since its first online release in 1995, the material in The Java(TM) Tutorial has been updated Abstract Methods continuously to reflect reader feedback and new releases of the Java platform This third edition has been thoroughly updated to cover v13 of the Java Platform, Standard Edition, as well as preceding versions as class can contain An abstract early as JDK 11 abstract methods methods with no implementation In this way, an abstract class can define a complete programming interface for its subclasses but allows its subclasses You will find clear explanations of such fundamentals In practice, abstract classes provide a complete to fill in the implementation details of those methodsas objects, classes, and data structures In addition, implementation of at least one to object-oriented programming, applet construction, and or partial the book provides introductions method If an abstract class contains only abstract method user interface should be implemented as exceptions, I/O, and threads To help beginners avoid many declarations, itdesign Other topics include an interface instead Interfaces are covered in the section common mistakes, Interfaces (page is devoted to programming problems and their solutions Creating and Using an entire chapter 228) Convenient summaries at the end of each section are new to this edition Also new for this edition are "Questions and example of when you help you practice what you learn Let's look at an Exercises" sections to might want to create an abstract class with an abstract method in it In an object-oriented drawing application, you can draw circles, rectangles, lines, B zier curves, After working through the lessons in this certain states (position, bounding box) and behaviors (move, and so on These graphic objects all haveproven tutorial, you will be well prepared to use the Java programming language in your school or workplace resize, draw) in common You can take advantage of these similarities and declare them all to inherit from the same parent object for example, GraphicObject, as shown in Figure 67
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Figure 67 Classes Rectangle,Line,Bezier, and Circle inherit certain states and behavior from their common parent, GraphicObject
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Graphic objects are substantially different in many ways: drawing a circle is quite different from drawing a rectangle The graphic objects cannot share these types of states or behavior On the other hand, all GraphicObjects must know how to draw themselves; they just differ in how they are drawn This is a perfect situation for an abstract superclass First, you would declare an abstract class, GraphicObject, to provide member variables and methods that were wholly shared by all subclasses, such as the current position and the moveTo method GraphicObject also declares abstract methods for methods, such as draw, that need to be implemented by all subclasses but that are implemented in entirely different ways (no default implementation in the superclass makes sense) The GraphicObject class would look something like Table of Contents this:
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Java Tutorial, Third Edition: A Short Course on the Basics, The abstract class GraphicObject {
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ByMary Campione,Kathy Walrath,Alison Huml int x, y;
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: December 28, 2000
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: 0-201-70393-9 Pagesabstract void draw(); : 592
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Each nonabstract subclass of GraphicObject, such as Circle and Rectangle, must provide an implementation for the draw method: "This book stands above the rest because it has been available on the web and read by thousands of Java programmers The authors have received an enormous amount of feedback about which sections class Circle extends GraphicObject the confusing ones have been improved I doubt that any are good and which sections are confusing; { othervoid book has { Java draw() undergone such trial by fire" -Metroplex Java User Group, wwwjavamugorg/reviews/
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} } Whether you're taking a class or learning on the job, The Java(TM) Tutorial, Third Edition , is a handsclass Rectangle extends become proficient { on guide that lets you quickly GraphicObject with the Java programming language Written by void draw() { members of the Java Software team at Sun Microsystems, the book uses an interactive approach to help you learn the Java platform by example } Since its first online release in 1995, the material in The Java(TM) Tutorial has been updated }
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continuously to reflect reader feedback and new releases of the Java platform This third edition has been thoroughly is not required to have an abstract method Standard Edition, as well as preceding An abstract class updated to cover v13 of the Java Platform, in it But any class that has an abstract versions as or that JDK not method in itearly as does11 provide an implementation for any abstract methods declared in its superclasses or implemented interfaces must be declared as an abstract class You will find clear explanations of such fundamentals as objects, classes, and data structures In addition, the book provides introductions to object-oriented programming, applet construction, and user interface design Other topics Summary of Managing Inheritanceinclude exceptions, I/O, and threads To help beginners avoid many common mistakes, an entire chapter is devoted to programming problems and their solutions Convenient summaries at the class each section are new superclass A Also new for this edition are Except for the Object class, aend of has exactly one direct to this editionclass inherits member "Questions and Exercises" sections to help you practice what you learn variables and methods from all its superclasses, whether direct or indirect A subclass can override methods that it inherits, or it can hide variables or methods that it inherits Table 41 on page 207 After working through the lessons in this proven tutorial, you will be well prepared to use the Java shows the effect of declaring a method with the same signature as a method in the superclass programming language in your school or workplace
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TheObject class is the top of the class hierarchy All classes are descendants from this class and inherit methods from it Useful methods inherited from Object include toString,equals,clone, getClass,wait,notify, and notifyAll You can prevent a class from being subclassed by using the final keyword in the class's declaration Similarly, you can prevent a method from being overridden by subclasses by declaring it as a final method
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An abstract class can only be subclassed; it cannot be instantiated An abstract class can contain abstract methods methods that are declared but not implemented Subclasses provide the implementations for abstract methods
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