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Whether you're taking a Initializing Instance and class or learning on the job, The Java(TM) Tutorial, Third Edition , is a handsClass Members on 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 You can provide an initial value for a class or an instance member variable in its declaration: help you learn the Java platform by example Since its first online release in 1995, the public class BedAndBreakfast { material in The Java(TM) Tutorial has been updated continuously to reflect final feedback and new releases of //initialize toThis third edition has public static reader int MAX_CAPACITY = 10; the Java platform 10 been private boolean full = v13 of the Java Platform, Standard Edition, as well as preceding thoroughly updated to cover false; //initialize to false versions as early as JDK 11 } You works well for member variables of primitive data types Sometimes, it data structures creating This will find clear explanations of such fundamentals as objects, classes, andeven works when In addition, the book provides form of initialization has limitations arrays and objects But this introductions to object-oriented programming, applet construction, and user interface design Other topics include exceptions, I/O, and threads To help beginners avoid many common mistakes, an entire chapter is devoted to programming problems and their solutions The initialization at the end of each section are new to this edition Also new for this edition an Convenient summariesmust be expressed in an assignment statement For example, you can't useare if-else Exercises" "Questions andstatement sections to help you practice what you learn
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The initialization expression in this call any method that is be well to throw a use the Java After working through the lessons cannot proven tutorial, you will declaredprepared to nonruntime (checked) exception programming language in your school or workplace If the initialization expression calls a method that throws a runtime exception, such as NullPointerException, it cannot do error recovery If these limitations prevent you from initializing a member variable in its declaration, you have to put the initialization code elsewhere To initialize a class member variable, put the initialization code in a static initialization block, as the following section shows To initialize an instance member variable, put
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Using Static Initialization Blocks Figure 51 shows an example of a static initialization block Figure 51 A static initialization block can be used to initialize class member variables
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import javautilResourceBundle; class Errors { static ResourceBundle errorStrings; static { try { Table of Contents = ResourceBundlegetBundle("ErrorStrings"); errorStrings } catch (javautilMissingResourceException e)on Java Tutorial, Third Edition: A Short Course { // error recovery code here the Basics, The } ByMary Campione,Kathy Walrath,Alison Huml } }
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TheerrorStrings resource bundle must be initialized in a static initialization block because the Pub Date : December 28, 2000 getBundle method can throw an exception if the bundle cannot be found The code should perform ISBN : 0-201-70393-9 error recovery Also, errorStrings is a class member, so it should not be initialized in a constructor Pages : 592 Astatic initialization block begins with the static keyword and is a normal block of code enclosed in braces:{ and } A class can have any number of static initialization blocks that appear anywhere in the class body The "This book stands above the rest because it has been available on the web and read by thousands of runtime system guarantees that static initialization blocks and static initializers are called in the order Java programmers bottom) that they appear an enormous amount of feedback about which sections (left to right, top to The authors have receivedin the source code 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/ Initializing Instance Members
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Whether you're taking a class or learning on the job, The Java(TM) Tutorial, Third Edition , is a handsIf you want to initialize an instance variable and cannot do it in the variable declaration for the reasons on guide that lets you quickly become proficient with the Java programming language Written by cited previously, put the initialization in the constructor(s) for the class If the errorStrings bundle members of the Java Software team at Sun Microsystems, the book uses an interactive approach to in the previous example were an instance variable rather than a class variable, you'd move the code help you learn the Java platform a constructor that initializes errorStrings to by example for the class, as follows: Since its first online release in 1995, the material in The Java(TM) Tutorial has been updated
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import javautilResourceBundle; new releases of the Java platform This third edition has continuously to reflect reader feedback and class Errors { been thoroughly updated to cover v13 of the Java Platform, Standard Edition, as well as preceding ResourceBundle 11 versions as early as JDKerrorStrings; Errors() { You will find clear explanations of such fundamentals as objects, classes, and data structures In try { addition, the book provides introductions to object-oriented programming, applet construction, and errorStrings = ResourceBundlegetBundle("ErrorStrings"); user interface design Other topics include exceptions, I/O, and threads To help beginners avoid many } catch (javautilMissingResourceException e) { common mistakes, error recovery is devoted to programming problems and their solutions // an entire chapter code here Convenient summaries at the end of each section are new to this edition Also new for this edition are } "Questions and Exercises" sections to help you practice what you learn } } Summary of Creating Classes
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A class definition has two parts: a class declaration and a class body For details about the components of a class declaration, refer to Figure 57 The class body contains member variables, methods, and constructors for the class A class uses member variables to contain state and uses methods to implement behavior Figure 58 shows all the possible components of a member variable declaration andFigure 61 shows all possible components of a method declaration Constructors initialize a new
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instance of a class and have the same name as the class You control access to member variables and methods in the same way: by using an access specifier, such as private or public, in the member's declaration Table 40 (page 193) shows the access specifiers and the effect of each You specify a class member variable or a class method by using the static keyword in the member's declaration A member that is not declared as static is implicitly an instance member Class variables are shared by all instance of a class and can be accessed through the class name Instances of a class get their own copy of each instance variable, which must be accessed through an instance reference
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