What Is an Exception in Java

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What Is an Exception
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The term exception is shorthand for the phrase "exceptional event"
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Definition Anexception is an event that disrupts the normal flow of instructions during the execution of a program
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Table of Contents
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Java Tutorial, Third Edition: A Short Course on
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When an error occurs within a method, the method creates an object and hands it off to the runtime the Basics, The system The object, called an exception object ,[1] contains information about the error, including its ByMary Campione,Kathy Walrath,Alison Huml type and the state of the program when the error occurred Creating an exception object and handing it to the runtime system is called throwing an exception
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: Addison Wesley [1] Pub Date Exception objects2000 : December 28, inherit from the Throwable class Publisher ISBN
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After a method throws an exception, the runtime system attempts to find something to handle it The Pages : 592 set of possible "somethings" to handle the exception is the ordered list of methods that had been called to get to the method where the error occurred The list of methods is known as the call stack (Figure 75)
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: 0-201-70393-9
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"This book stands above the rest because it has been available on the web and read by thousands of Figure 75 The call stack Java programmers The authors have received an enormous amount of feedback about which sections 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/ 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 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 the call stack new method of the Java platform This third edition has The runtime system searches feedback and for a releases that contains a block of code that can handle been thoroughly updated to cover called the Java Platform, Standard Edition, as with the method the exception This block of code isv13 of an exception handler The search beginswell as preceding in versions as early as JDK and which the error occurred 11 proceeds through the call stack in the reverse order that the methods were called When an appropriate handler is found, the runtime system passes the exception to the You will An clear explanations of such fundamentals as if the type of the exception object thrown handlerfind exception handler is considered appropriate objects, classes, and data structures In is addition, as book provides introductions by the handler The exception handler construction, to the same the the type that can be handledto object-oriented programming, applet chosen is said and user the exception If the runtime system exhaustively searches all the methods on the call stack catchinterface 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 without finding an appropriate exception handler, the runtime system (and, consequently, the Convenient summaries at the end program) terminates (Figure 76) 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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Figure 76 When an error occurs, the runtime system searches the call stack for an After working through the lessons in this proven tutorial, you will be well prepared to use the Java appropriate error handler programming language in your school or workplace
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Using exceptions to manage errors has some advantages over traditional error-management techniques You can learn more in the section Advantages of Exceptions (page 260)
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