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Now consider the next line of code in Clock'sstart method, shown here in boldface:
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public void start() {
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if (clockThread == null) { clockThread = new Thread(this, "Clock"); clockThreadstart(); } }
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Thestart method creates the system resources necessary to run the thread, schedules the thread to run, and calls the thread's run method ClockThread'srun method is the one defined in the Clock class After the start method has returned, the thread is "running" Yet it's somewhat more complex than that As Figure 82 shows, a thread that has been started is in the Runnable state Many computers have a single processor, thus making it impossible to run all "running" threads at the same time The Java runtime environment must implement a scheduling scheme that shares the processor among all "running" threads (See the section Understanding Thread Priority (page 286) for more information about scheduling) of Contentsgiven time, a "running" thread may be waiting for its turn in the CPU Table So at any
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Java Tutorial, Third Edition: Here's another look at Clock'srun method: the Basics, The
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ByMary void run() Walrath,Alison Huml publicCampione,Kathy { Thread myThread = ThreadcurrentThread(); while (clockThread Publisher : Addison Wesley == myThread) { Pub Date repaint(); : December 28, 2000 try { ISBN : 0-201-70393-9 Threadsleep(1000); Pages : 592 } catch (InterruptedException e) { //the VM doesn't want us to sleep anymore, //so get back to work } "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 }
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are good and which sections are confusing; the confusing ones have been improved I doubt that any other Java book has undergone the trial by clockThread == myThread is true Clock'srun method loops while suchconditionfire" -Metroplex Java User Group, This exit wwwjavamugorg/reviews/ condition is explained in more detail in the section Stopping a Thread (page 285) For now, however,
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know that it allows the thread, and thus the applet, to exit gracefully 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 Within the loop, the applet repaints itself and then tells the thread to sleep for 1 second (1,000by members of the applet's repaint method Microsystems, the applet's paint method, approach to milliseconds) AnJava Software team at Sun ultimately calls the book uses an interactive which does the help you the the Java platform by example update oflearnapplet's display area The Clockpaint method gets the current time, formats, and displays it: 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 public void paint(Graphics g) { of the Java Platform, Standard Edition, as well as preceding been thoroughly updated to cover v13 //get the time 11 versions as early as JDKand convert it to a date
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Calendar cal = CalendargetInstance(); Date date explanations of such You will find clear = calgetTime(); fundamentals as objects, classes, and data structures In //format it and display it addition, the book provides introductions to object-oriented programming, applet construction, and user DateFormat dateFormatter = DateFormatgetTimeInstance(); interface design Other topics include exceptions, I/O, and threads To help beginners avoid many gdrawString(dateFormatterformat(date), 5, 10); 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 Making a Thread Not Runnable
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After working through the lessons in this proven tutorial, you will be well prepared to use the Java programming language in your school or workplace A thread becomes Not Runnable when one of these events occurs:
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Itssleep method is invoked The thread calls the wait method to wait for a specific condition to be satisfied The thread is blocking on I/O
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TheclockThread in the Clock applet becomes Not Runnable when the run method calls sleep on the current thread:
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public void run() { Thread myThread = ThreadcurrentThread(); while (clockThread == myThread) { repaint(); try { Threadsleep(1000); } catch (InterruptedException e) { //the VM doesn't want us to sleep anymore, //so get back to work } } Table of Contents }
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During the second that the clockThread is asleep, the thread does not run, even if the processor the Basics, The becomes available After the second has elapsed, the thread becomes Runnable again; if the processor becomes available, the Walrath,beginsHuml ByMary Campione,Kathy thread Alison running again For each entrance into the Not Runnable state, a specific and distinct exit returns the thread to the Publisher : Addison Wesley Runnable state An exit works only for its corresponding entrance For example, if a thread has been Pub Date : December 28, 2000 put to sleep, the specified number of milliseconds must elapse before the thread becomes Runnable ISBN The : 0-201-70393-9 again following list describes the exit for every entrance into the Not Runnable state
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Pages : 592
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