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If your method overrides one of its superclass's methods, you can invoke the overridden method through the use of super You can also use super to refer to a hidden member variable Consider this class, Superclass:[1] is included on the CD and is available online See Code Samples (page 224)
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[1]Superclassjava
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public class Superclass { public boolean aVariable; public void aMethod() { aVariable = true; } }
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Now, here's a subclass, called Subclass,[1] that overrides aMethod and hides Table of aVariableContents :
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Java Tutorial, Third Edition: A Short Course on [1]Subclassjava is included on the CD and is available online See Code the Basics,Samples (page 224) The
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public class Subclass extends Superclass { public boolean aVariable; //hides aVariable in Superclass Publisher : Addison Wesley public void aMethod() { //overrides aMethod in Superclass Pub Date : December 28, 2000 aVariable = false; ISBN : 0-201-70393-9 superaMethod(); Pages : 592 Systemoutprintln(aVariable); Systemoutprintln(superaVariable); } }
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"This book stands above the rest because it has been available on the web and read by thousands of WithinSubclass, the simple name aVariable an enormous one declared in SubClass, which sections Java programmers The authors have received refers to the amount of feedback about which hides the good and which Superclass Similarly, the confusing ones have been improved I doubt that in are one declared in sections are confusing; the simple name aMethod refers to the one declared any Subclass, book has undergone one in Superclass -Metroplex Java User Group, aMethod inherited other Java which overrides the such trial by fire" So to refer to aVariable and fromSuperclass,Subclass must use a qualified name, using super as shown Thus, the print wwwjavamugorg/reviews/ statements in Subclass'saMethod displays the following: 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 false members of the Java Software team at Sun Microsystems, the book uses an interactive approach to true help you learn the Java platform by example
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You can also use super within a constructor to invoke a superclass's constructor The following code Since its first online release in 1995, the material in The Java(TM) Tutorial has been updated sample is a partial listing of a subclass of Thread a core class used to implement multitasking continuously to reflect reader feedback and new releases of the Java platform This third edition has behavior which performs an animation The constructor for AnimationThread sets up some default been thoroughly updated to cover v13 of the Java Platform, Standard Edition, as well as preceding values, such as the frame speed and the number of images, and then loads the images: versions as early as JDK 11
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You will find clear explanations of such fundamentals as objects, classes, and data structures In class AnimationThread extends Thread { addition, the book provides introductions to object-oriented programming, applet construction, and int framesPerSecond; user interface design Other topics include exceptions, I/O, and threads To help beginners avoid many int numImages; common mistakes, an entire chapter is devoted to programming problems and their solutions Image[] images; Convenient summaries at the end of each section are new to this edition Also new for this edition are AnimationThread(int fps, help you { "Questions and Exercises" sections toint num)practice what you learn
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super("AnimationThread"); thisframesPerSecond this proven tutorial, you will be well prepared to use the Java After working through the lessons in = fps; thisnumImages = num; programming language in your school or workplace thisimages = new Image[numImages]; for (int i = 0; i <= numImages; i++) { // Load all the images } }
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The line set in boldface is an explicit superclass constructor invocation that calls a constructor provided by the superclass of AnimationThread, namely, Thread This particular Thread constructor takes a String that sets the name of Thread If present, an explicit superclass constructor invocation must be the first statement in the subclass constructor: An object should perform the higher-level initialization first If a constructor does not explicitly invoke a superclass constructor, the Java runtime system automatically invokes the no-argument constructor of the superclass before any statements within the constructor are executed
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