How to Throw Exceptions in Java

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How to Throw Exceptions
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Before you can catch an exception, some code somewhere must throw one Any code can throw an exception: your code, code from a package written by someone else (such as the packages that come with the Java platform), or the Java runtime environment Regardless of what throws the exception, it's always thrown with the throw statement As you have probably noticed, the Java platform provides numerous exception classes All these classes are descendants of the Throwable class And all allow programs to differentiate among the various types of exceptions that can occur during the execution of a program You also can create your own exception classes to represent problems that can occur within the Table of Contents classes that you write Indeed, if you are a package developer, you might have to create your own set Java Tutorial, Third Edition: to differentiate an error that of exception classes so as to allow your usersA Short Course on can occur in your package from errors that occur in the Java platform or other packages the Basics, The
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The throw Statement Publisher : Addison Wesley
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All methods use the throw statement to throw an exception The throw statement requires a single ISBN : 0-201-70393-9 argument: a throwable object Throwable objects are instances of any subclass of the Throwable[1] Pages : 592 class Here's an example of a throw statement:
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[1]http://javasuncom/j2se/13/docs/api/java/lang/Throwablehtml
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Pub Date
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"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 are good at which sections are confusing; the confusing ones method is taken from doubt that Let's lookandthe throw statement in context The following pophave been improved I a classthat any other Java book has undergone such trial by fire" -Metroplex Java User Group, implements a common stack object The method removes the top element from the stack and returns wwwjavamugorg/reviews/ the object:
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Whether you're taking a class or learning on the job, The Java(TM) Tutorial, Third Edition , is a hands-
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public Object pop() throws EmptyStackException { programming language Written by on guide that lets you quickly become proficient with the Java Object obj; members of the Java Software team at Sun Microsystems, the book uses an interactive approach to
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throw new EmptyStackException(); 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 been obj = objectAt(size - 1); of the Java Platform, Standard Edition, as well as preceding thoroughly updated to cover v13 versions as early as JDK 11 1, null); setObjectAt(size You will find clear explanations of such fundamentals as objects, classes, and data structures In return obj; 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 solutions Thepop method checks whether any elements are on the stack If the stack is empty (its size is equal Convenient summaries at the end of each section are object (a member Also new for this edition are to 0), pop instantiates a new EmptyStackExceptionnew to this edition of javautil) and throws it "Questions and Exercises" sections to help you practice what you learn Later sections in this chapter explain how you can create your own exception classes For now, all you need to remember is that you can throw only objects that inherit from the javalangThrowable After working through the lessons in this proven tutorial, you will be well prepared to use the Java class programming language in your school or workplace
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Note that the declaration of the pop method contains a throws clause EmptyStackException is a checked exception, and the pop method makes no effort to catch it Hence, the method must use the throws clause to declare that it can throw that type of exception
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