Classes in the ClickMe Applet in Java

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Classes in the ClickMe Applet
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Because the object that represents the spot hasthe screen is very simple, let's look at its class, named "This book stands above the rest because it on been available on the web and read by thousands of Spot It declares three instance have received an enormous amountradius, x contains the spot's Java programmers The authors variables: size contains the spot's of feedback about which sections current horizontal location, and yconfusing; the confusing ones have been improved I doubt that any are good and which sections are contains the spot's current vertical location:
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other Java book has undergone such trial by fire" -Metroplex Java User Group, wwwjavamugorg/reviews/ public class Spot { Whether you're taking a class or learning on the job, The Java(TM) Tutorial, Third Edition , is a handspublic int size; on guide that lets you quickly become proficient with the Java programming language Written by public int x, y; members of the Java Software team at Sun Microsystems, the book uses an interactive approach to //constructor help you learn the Java platform by example
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//instance variables
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public Spot(int intSize) { size = intSize; Since its first online release in 1995, the material in The Java(TM) Tutorial has been updated x = -1; continuously to reflect reader feedback and new releases of the Java platform This third edition has y = -1; 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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You will find clear explanations of such fundamentals as objects, classes, and data structures In Additionally, the class has a constructor a subroutine used to initialize new objects created from the addition, the book provides introductions to object-oriented programming, applet construction, and class You can recognize a constructor because it has the same name as the class The constructor user interface design Other topics include exceptions, I/O, and threads To help beginners avoid many initializes all three of the object's variables The initial value of size is provided as an argument to the common mistakes, an entire chapter is devoted to programming problems and their solutions constructor by the caller (intSize) The x and y variables are set to -1, indicating that the spot is not Convenient summaries at the end of each section are new to this edition Also new for this edition are on-screen when the applet starts up "Questions and Exercises" sections to help you practice what you learn
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The applet creates a new spot object when the applet is initialized Here's the relevant code from the After working through the lessons in this proven tutorial, you will be well prepared to use the Java applet class: programming language in your school or workplace
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private Spot spot = null; private static final int RADIUS = 7; spot = new Spot(RADIUS);
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The first line shown declares a variable named spot whose data type is Spot, the class from which
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the object is created, and initializes the variable to null[1] The second line declares an integer variable named RADIUS whose value is 7 Finally, the last line shown creates the object; new allocates memory space for the object Spot(RADIUS) calls the constructor you saw previously and passes in the value of RADIUS Thus, the spot object's size is set to 7, as shown in Figure 39
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The keyword null is used to specify an undefined value for variables that refer to objects
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Figure 39 The figure on the left is a representation of the Spot class The figure on the right is a spot object
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Table of Contents
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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
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Messages in the ClickMe Applet
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Publisher : Addison Wesley Pub Date : December can use As you know, object A 28, 2000 a message to request that object B do something, and a message has three components: ISBN : 0-201-70393-9 Pages : 592
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The object to which the message is addressed The name of the method to perform "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 Any parameters the method needs are good and which sections are confusing; the confusing ones have been improved I doubt that any Here are two lines ofundergone such trial by fire" -Metroplex Java User Group, other Java book has code from the ClickMe applet: wwwjavamugorg/reviews/
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gsetColor(Colorwhite); Whether you're taking a class or learning on the job, The Java(TM) Tutorial, Third Edition , is a handsgfillRect(0, 0, getSize()width - 1, getSize()height - 1);
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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 Both are messages from the applet to an object named g aGraphics object that knows how to draw help you learn the Java platform by example simple on-screen shapes and text This object is provided to the applet when the browser instructs the applet to draw itself The first line sets the color to white; the second fills a rectangle the size of the Since its first online release in 1995, the material in The Java(TM) Tutorial has been updated applet, thus painting the extent of the applet's area white 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 Figure 40 highlights each message component in the first message versions as early as JDK 11
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Figure 40 The message components as message in the ClickMe applet You will find clear explanations of such fundamentalsof aobjects, classes, and data structures In addition, the book provides 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 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