Advantages of Exceptions in Java

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Advantages of Exceptions
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Now that you've read about what exceptions are and how to use them, it's time to learn the advantages of using exceptions in your programs
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Advantage 1: Separating Error-Handling Code from "Regular" Code
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Exceptions provide the means to separate the details of what to do when something out of the ordinary happens from the main logic of a program In traditional programming, error detection, reporting, and handling often lead to confusing spaghetti code For example, consider the following Table of Contents pseudocode method that reads an entire file into memory:
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Java Tutorial, Third Edition: A Short Course on readFile { the Basics, The
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open the file; ByMary Campione,Kathy Walrath,Alison Huml determine its size; allocate that much memory; Publisher : Addison Wesley read the file into memory; Pub Date close: December 28, 2000 the file; ISBN : 0-201-70393-9 }
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Pages : 592
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At first glance, this function seems simple enough, but it ignores all these potential errors
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What happens if the file can't be opened "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 What happens if the length of the file can't be determined are good and which sections are confusing; the confusing ones have been improved I doubt that any other What book has undergone such trial by fire" -Metroplex Java User Group, Java happens if enough memory can't be allocated wwwjavamugorg/reviews/ What happens if the read fails 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 What happens if the file can't be closed members of the Java Software team at Sun Microsystems, the book uses an interactive approach to help you learn the Java platform by example To handle these cases, the readFile function must have more code to do error detection, reporting, and handling The function might look like this: 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 errorCodeTypereadFile { been thoroughly updated to cover v13 of the Java Platform, Standard Edition, as well as preceding initialize errorCode = 0; versions as early as JDK 11
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open the file;
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if (theFileIsOpen) { You will find clear explanations of such fundamentals as objects, classes, and data structures In determine the length of to object-oriented programming, applet construction, and addition, the book provides introductions the file; if (gotTheFileLength) { exceptions, I/O, and threads To help beginners avoid many user interface design Other topics include allocate that much memory; common mistakes, an entire chapter is devoted to programming problems and their solutions if (gotEnoughMemory) { Convenient summaries at the end of each section are new to this edition Also new for this edition are read the file into memory; "Questions and Exercises" sections to help you practice what you learn if (readFailed) { errorCode = proven tutorial, you will be well prepared to use the Java After working through the lessons in this -1; } programming language in your school or workplace } else { errorCode = -2; } } else { errorCode = -3; } close the file;
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if (theFileDidntClose && errorCode == 0) { errorCode = -4; } else { errorCode = errorCode and -4; } } else { errorCode = -5; } return errorCode; }
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There's so much error detection, reporting, and returning here that the original seven lines of code are lost in the clutter Worse yet, the logical flow of the code also has been lost, thus making it difficult to tell whether the code is doing the right thing: Is the file really being closed if the function fails to allocate enough memory It's even more difficult to ensure that the code continues to do the right Table of Contents thing after you modify the function 3 months after writing it Many programmers "solve" this problem by simply ignoring it errors are "reported" when their programs crash
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Java Tutorial, Third Edition: A Short Course on Exceptions enable you to write the main flow of your code and to deal with the exceptional cases the Basics, The
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elsewhere If the Kathy Walrath,Alison Huml exceptions instead of traditional error-management ByMary Campione, readFile function used techniques, it would look more like this:
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