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ByMary Campione,Kathy Walrath,Alison Huml This class contains a set of constructors Each constructor initializes some or all of the rectangle's member variables The constructors provide a default value for any member variable whose initial value is not provided by an argument For example, the no-argument construc-tor calls the fourPublisher : Addison Wesley argument constructor,28, 2000 as default values As before, the compiler determines which Pub Date : December using 0s constructor to call, based on the number and the type of arguments ISBN : 0-201-70393-9 : 592
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If present, an explicit constructor invocation must be the first line in the constructor
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Pages
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Controlling Access to Members of a Class
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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 call a An access specifier determines whether other classes can use a particular member variable or sections are good method sections are confusing; the confusing ones have been access levels for member particularand whichThe Java programming language supports four distinct improved I doubt that any other Java book has undergone protected, public, and, if left unspecified, Group, variables and methods: private, such trial by fire" -Metroplex Java User package [1]Table 40 shows wwwjavamugorg/reviews/ the access permitted by each level Whether The 10taking a class or learning on the job, The Java(TM) Tutorial, Third Edition , the four [1] you're release of the Java programming language supported five access levels: is a handson guide that lets you quickly become proficient with the access level is not supported in versions of listed plus private protected The private protected Java programming language Written by members JDK higher than 10; you should not use it the 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 Table 40 Access Levels been thoroughly updated to cover v13 of the Java Platform, Standard Edition, as well as preceding versions as early as JDK 11
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Specifier Class Package Subclass World You will find clear explanations of such fundamentals as objects, classes, and data structures In private _ _ _ addition, the book provides introductions to object-oriented programming, applet construction, and no specifier _ _ user interface design Other topics include exceptions, I/O, and threads To help beginners avoid many protected common mistakes, an entire chapter is devoted to programming problems and their solutions _ [a] Convenient summaries at the end of each section are new to this edition Also new for this edition are public "Questions and Exercises" sections to help you practice what you learn
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[a] The protected/subclass case has an interesting twist discussed in detail on page 197 After working through the lessons in this proven tutorial, you will be well prepared to use the Java programming language in whether the class itself has The first column indicates your school or workplace access to the member defined by the access specifier As you can see, a class always has access to its own members The second column indicates whether classes in the same package as the class (regardless of their parentage) have access to the member A package groups related classes and interfaces and provides access protection and namespace management You'll learn more about packages in the section Creating and Using Packages (page 234) The third column indicates whether subclasses of the class regardless of which package they are in have access to the member The fourth column indicates whether all classes have access to the member
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Access levels affect you in two ways First, when you use classes that come from another source, such as the classes in the Java platform, access levels determine which members of those classes your classes can use Second, when you write a class, you need to decide what access level every member variable and every method in your class should have One way of thinking about access levels is in terms of the API: Access levels directly affect the public API of a class and determine which members of the class can be used by other classes You need to put as much effort into deciding the access level for a member as you put into making other decisions about your class's API, such as naming methods Let's look at a collection of classes and see access levels in action Figure 63 shows the four classes that comprise this example and how they are related Figure 63 The classes and packages that comprise the example used to illustrate access levels
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