Creating Classes in Java

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This section shows you the main components of a class by using a small example that implements a stack a data structure whose items are added and removed in a last-in-first-out (LIFO) fashion Figure 56 lists the Stack[1] class and identifies the structure of the code is included on the CD and is available online See Code Samples (page 224)
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[1]Stackjava
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Figure 56 The Table of Contents Stack class and the structure of a class definition
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Java Tutorial, Third Edition: A Short Course on the Basics, The
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ByMary Campione,Kathy Walrath,Alison Huml Publisher Pub Date ISBN Pages : Addison Wesley : December 28, 2000 : 0-201-70393-9 : 592
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"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 are good and which sections are confusing; the confusing ones have been improved I doubt that any other Java book has undergone such trial by fire" -Metroplex Java User Group, wwwjavamugorg/reviews/ Whether you're taking a class or learning on the job, The Java(TM) Tutorial, Third Edition , is a handson guide that lets you quickly become proficient with the Java programming language Written by 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 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 early as JDK 11 A class definition has two main components: the class declaration and the class body The class declaration is the first line of codesuch class At a minimum, the class declaration declares the In You will find clear explanations of in a fundamentals as objects, classes, and data structures name of the classthe book provides introductions to object-oriented programming, applet construction, and addition, user interface design Other topics include exceptions, I/O, and threads To help beginners avoid many The classmistakes, an entire chapter is devoted to programming problems { and } The class body common body follows the class declaration and appears between braces and their solutions contains all summaries at provides of each life cycle of new objects edition Also new class: constructors Convenient the code that the end for the section are the to this created from the for this edition are for initializing new objects,sections to help you practice what you learn state of the class and its "Questions and Exercises" declarations for the variables that provide the objects, and methods to implement the behavior of the class and its objects The Stack class defines one member variable within the class body the items vector The Stack class also defines one After working through the lessons in this proven tutorial, you will be well prepared to use the Java constructor alanguage in your school or workplace methods: push,pop, and isEmpty programming no-argument constructor and three
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Declaring a Class
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You've seen many class definitions of the following form:
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classMyClass { //member variable and method declarations }
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The first line of code is called the class declaration The preceding class declaration is a minimal class declaration; it contains only those components of a class declaration that are required Certain aspects of this class, though unspecified, are assumed The most important is that the direct superclass of MyClass is the Object class You can provide more information about the class, such as the name of its superclass, whether it implements any interfaces, whether it can be subclassed, and so on, within the class declaration Figure 57 shows all the possible components of a class declaration in the order they should or must appear The right-hand side describes the purpose of each component The required components are shown in boldface All the other components are optional, and each appears on a line by itself within the diagram (thus, extendsSuper is a single component), but you don't have to write your code that Table of Contents way Italic indicates an identifier, such as the name of a class or an interface If you do not explicitly declare the optional items, the Java platform assumes certain defaults: a nonpublic, nonabstract, Java Tutorial, Third Edition: A Short Course on nonfinal subclass of Object that implements no interfaces
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