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If your program creates and refers to its GUI the correct way, you might not need to worry about threads[1] If your program is an applet, it's safe to construct its GUI in the init method You're also safe if your program is an application with the following common pattern: For general information on threads, see 8, Threads: Doing Two or More Tasks at Once (page 269)
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//Thread-safe example public class MyApplication { public Table of Contentsmain(String[] args) { static void JFrame f = new JFrame(); A Short Course Java Tutorial, Third Edition: //Add components to the frame here the Basics, The fpack(); ByMary Campione,Kathy Walrath,Alison Huml fsetVisible(true); //Don't do any more GUI work here } Publisher : Addison Wesley
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Pub Date ISBN : December 28, 2000
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0-201-70393-9 //All: manipulation of the GUI -- setText, getText, etc Pages : 592 //is performed in event handlers such as actionPerformed() }
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"This book your program creates threads to perform available affect the and read by thousands of However, ifstands above the rest because it has been tasks thaton the web GUI or if it manipulates an Java programmers The authors have received a enormous amount of feedback about which sections already visible GUI in response to anything but anstandard event, read on 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/ The Single-Thread Rule Whether you're taking a class or learning on the job, The Java(TM) Tutorial, Third Edition , is a handsSwing components can be accessed by only one thread at a time, generally the event-dispatching on guide that lets you quickly become proficient with the Java programming language Written by thread Thus, the single-thread rule is as follows 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 Rule been thoroughly updated to cover v13 of the Java Platform, Standard Edition, as well as preceding versions asaearly ascomponent has been realized, all code that might affect or depend on the Once Swing JDK 11 state of that component should be executed in the event-dispatching thread You will find clear explanations of such fundamentals as objects, 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 about threads This rule might sound scary, but for many simple programs, you don't have to worrysolutions Convenient summaries at the end of each section are new to this edition Also new for this edition are Before we go into detail about how to help you practice what you learn term realized Realized means "Questions and Exercises" sections to write Swing code, let's define the that the component has been painted on-screen or that it is ready to be painted A Swing component After a top-level window lessons in this proven tutorial, you will be invoked on it: that'sworking through theis realized by having one of these methods well prepared to use the Java setVisible(true),showyourpack Once a window is realized, all the compo-nents it contains are programming language in , or school or workplace realized Another way to realize a component is to add it to a container that's already realized You'll see examples of realizing components later
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