Scenario 2: An ArrayIndexOutOfBoundsException Occurs in Java

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Scenario 2: An ArrayIndexOutOfBoundsException Occurs
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In this scenario, the argument passed to the Vector'selementAt method is out of bounds The argument is either less than 0 or is larger than the size of the array Because of how the code is written, this is impossible, but suppose that a bug is introduced into the code when someone modifies it As in scenario 1, when the exception occurs, the runtime system stops executing the try block and attempts to locate an exception handler for an ArrayIndexOutOfBoundsException The runtime system searches for an appropriate exception handler It finds the catch statement in the writeList method, which handles exceptions of the type ArrayIndexOutOfBoundsException Because the type of the thrown exception matches the type of the exception handler, the runtime system executes this exception handler After the exception handler has run, the runtime system passes control to the finally block In this particular scenario, the PrintWriter was open, so the finally statement closes it After the finally block has completed executing, the program continues with the first statement after the Table of Contents finally block Following is the complete output that you see from the ListOfNumbers program when an the Basics, The ArrayIndexOutOfBoundsException is thrown:
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Entering try statement Publisher : Addison Wesley Caught ArrayIndexOutOfBoundsException: 10 >= 10 Pub Date : December 28, Closing PrintWriter 2000
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ISBN : 0-201-70393-9 Pages : code The boldface592 in the following listing shows the statements that get executed during this scenario:
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public void writeList() { PrintWriter out = null;
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"This book stands above the rest because it has been available on the web and read by thousands of Java try { programmers The authors have received an enormous amount of feedback about which sections Systemoutprintln("Entering confusing ones have are good and which sections are confusing; the try statement"); been improved I doubt that any other Javaout =has undergone such trial by fire" -Metroplex Java User Group, book new PrintWriter(new FileWriter("OutFiletxt")); wwwjavamugorg/reviews/
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for (int i = 0; i < size; i++) { outprintln("Value at: " + i + " = " + victorelementAt(i)); Whether you're taking a class or learning on the job, The Java(TM) Tutorial, Third Edition , is a hands} on guide that lets you quickly become proficient with the Java programming language Written by } catch (ArrayIndexOutOfBoundsException e) { members of the Java Software team at Sun Microsystems, the book uses an interactive approach to Systemerrprintln("Caught ArrayIndexOutOfBoundsException: " help you learn the Java platform by example + egetMessage()); catch (IOException e) { Since}its first online release in 1995, the material in The Java(TM) Tutorial has been updated Systemerrprintln("Caught IOException: " Java platform This third continuously to reflect reader feedback and new releases of the + egetMessage()); edition has } finally updated to cover v13 of the Java Platform, Standard Edition, as well as preceding been thoroughly { if (out != 11 versions as early as JDK null) { Systemoutprintln("Closing PrintWriter"); outclose(); You will find clear explanations of such fundamentals as objects, classes, and data structures In } book { addition, the else provides introductions to object-oriented programming, applet construction, and Systemoutprintln("PrintWriter not open"); 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
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After working through the lessons in this proven tutorial, you will be well prepared to use the Java Scenario 3: The try Block Exits Normally programming language in your school or workplace
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In this scenario, all the statements within the scope of the try block execute successfully and throw no exceptions Execution falls off the end of the try block, and the runtime system passes control to thefinally block Because everything was successful, the PrintWriter is open when control reaches the finally block, which closes the PrintWriter Again, after the finally block has completed executing, the program continues with the first statement after the finally block Here is the output from the ListOfNumbers program when no exceptions are thrown:
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