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If you need to define a number of custom exceptions for use in a single application or library, you should define a single custom exception that extends System.Exception and use this as a common base class for all of your other custom exceptions. There is very little point in extending System.Application, as is often recommended. Doing so simply introduces another level in your exception hierarchy and provides little if any benefit when handling your exception classes after all, catching a nonspecific exception like ApplicationException is just as bad a practice as catching Exception.

Groovy contains first-class constructs for two of the most commonly used collections in Java: List and Map. This new syntax, combined with operator overloading and additional methods that use closures (provided by Groovy to extend the Java collection API), is a powerful combination best illustrated with some examples. See, for instance, Listing A-9. Listing A-9. Collections in Action 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 // prints 1 2 3 separated by new lines to standard out [1,2,3].each { num -> println num } // create an empty list def list = [] // use overloaded left shift operator to append items list << 'one' << 'two' << 'three' // check that we have 3 items assert list.size() == 3 // Use Groovy's findAll method to find all words containing the letter "o" assert list.findAll { item -> item.contains('o') }.size() == 2 // Merges a list into a string using the supplied string assert list.join(',') == 'one,two,three' // map of contact numbers def contacts = [ Fred : '903-0200-1565', Wilma: '903-0207-7401' ] contacts.each { key, value -> println "calling $key on $value" } // add new contact

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Exception classes are unique in the fact that you do not declare new classes solely to implement new or extended functionality. The runtime s exception-handling mechanism exposed by the C# statements try, catch, and finally works based on the type of exception thrown, not the functional or data members implemented by the thrown exception. If you need to throw an exception, you should use an existing exception class from the .NET Framework class library, if a suitable one exists. For example, some useful exceptions include the following: System.ArgumentNullException, when code passes a null argument value to your method that does not support null arguments System.ArgumentOutOfRangeException, when code passes an inappropriately large or small argument value to your method System.FormatException, when code attempts to pass your method a String argument containing incorrectly formatted data If none of the existing exception classes meets your needs, or you feel your application would benefit from using application-specific exceptions, it s a simple matter to create your own exception class. In order to integrate your custom exception with the runtime s exception-handling mechanism and remain consistent with the pattern implemented by .NET Framework defined exception classes, you should do the following: Give your exception class a meaningful name ending in the word Exception, such as TypeMismatchException or RecordNotFoundException. Mark your exception class as sealed if you do not intend other exception classes to extend it. Implement additional data members and properties to support custom information that the exception class should provide. Implement three public constructors with the signatures shown here and ensure they call the base class constructor. public CustomException() : base() {} public CustomException(string msg): base(msg) {} public CustomException(string msg, Exception inner) : base(msg, inner) {}

21 contacts.Dino = '903-0207-0349' 22 assert contacts.size() == 3 Here you can see various usages of Groovy lists and maps. First in line 2 there is an example of using Groovy s each method to iterate over a list of integer values: 2 [1,2,3].each { num -> println num }

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