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Allocated Resources Perform work... Finally clause executed Release Resources Press enter to finish The statements in the finally clause are executed, even though no exception has been thrown, ensuring that we can release resource (or perform any other actions) whatever happens. A try statement can have only one finally clause, and it must be the last clause defined in the statement. You do not define an exception or identifier because the code statements will be executed even if there is no exception. You can use a finally clause on a try statement that doesn t have any catch clauses; this is shown in Listing 14-12. Listing 14-12. A try Statement with a finally Clause but No catch Clauses try { // statements which uses the resources // and which may cause an exception Console.WriteLine("Perform work..."); // define a loval variable string myLocalVar = null; // try to so something with the local variable Console.WriteLine("First letter: {0}", myLocalVar[0]); } finally { Console.WriteLine("Finally clause executed"); // release the resources ReleaseResources(); } This example won t handle an exceptions that are thrown, but the statements in the finally clause will be executed whether an exception is thrown by one of the code statements.

Don t forget to include the bug number or incident number with the correction If you don t have a bug number or incident number, submit a bug report first For additional information on the different roles in a javanet project, see the JDK Community Governance Guidelines (https://jdkdevjavanet/governancehtml) When getting started, a good place to get answers to questions about Mustang is in Sun s forums, at http://forumsjavanet/jive/forumjspa forumID=23..

Handling exception is only half of the story. You also need to throw them in your code when errors occur. This is done using the throw keyword, as demonstrated by Listing 14-13. Listing 14-13. Using the throw Keyword using System; class Listing 13 {

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static void Main(string[] args) { // define a string array string[] array = { "orange", "apple", "pear" }; try { // make a call to the GetStringLength method int result = GetStringLength(array, 2); Console.WriteLine("Result: {0}", result); // make a call that will cause an exception result = GetStringLength(array, 100); } catch (Exception ex) { Console.WriteLine(ex.ToString()); } // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } static int GetStringLength(string[] array, int index) { if (index < array.Length) { return array[index].Length; } else { throw new Exception(); } } } In this example, the static GetStringLength method throws an exception if the index parameter is greater or equal to the length of the array parameter. The throw statement is marked in bold and must always be followed by an instance of System.Exception or of a class that derives from System.Exception. You can create and throw a new exception in a single statement as shown in the example, or you can create and throw on separate statements; you can see an example of this in Listing 14-14. Execution of your code statements stops when you throw an exception. The runtime will begin searching for a handler to process your exception. The throw statement in the example throws a new instance of the base exception class. This is not especially helpful to anyone using this method because it contains no useful information about what went wrong. If we compile and run the code in Listing 14-13, we get the following results: Result: 4 System.Exception: Exception of type 'System.Exception' was thrown. at Listing 13.GetStringLength(String[] array, Int32 index) in C:\Listing 13\Listing 13.cs:line 31 at Listing 13.Main(String[] args) in C:\Listing 13\Listing 13.cs:line 16 Press enter to finish

The convention in C# is that the type of the exception class that is used illustrates the nature of the exception that has been thrown and that as much information as possible is provided in the exception so that it can be handled as effectively as possible. To make this process easier, the .NET class library contains a selection of exceptions that are derived from System.Exception that you can use for commonly occurring problems. Some of these exceptions are described in Table 14-3; all of these classes are in the System namespace. See 11 for details of namespaces and how to use them. Table 14-3. Convenience Exceptions from the .NET Framework Class Library

Use when an argument passed to a method is null. Use when an argument passed to a method is outside the supported range. Use when an attempt is made to access an index that is out of the supported range. Use when a method is not implemented for example when an interface method has no relevance for a given implementation or when a derived class is expected to implement an overridden version of the method. Use when a method is not supported. Usually used when a derived class is expected to implement the method.

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