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Direct interaction with prompts is caused by a program operating system (OS) or application reading from the screen The program could have immediately preceded the read with a display of the prompt, or it could have displayed the prompt previously and placed the cursor appropriately The most direct processing of the read text is evaluation and branching, with successive conditional tests, and error messages for any text that doesn t meet all of the requirements the program has for a directive in the current context This is an example of the processes of a command interpreter As relatively advanced an interface as a form is, the interactive implementation is as simple as moving the cursor from field to field, handling each directly The noninteractive implementation entails mapping the fields to a set of variables and handling the set, addressing the variables in any order.

You can make your code explicitly raise an exception by using the throw statement. The syntax for the throw statement is the following: throw ExceptionObject; For example, the following code defines a method called PrintArg, which takes a string argument and prints it out. Inside the try block, it first checks to make sure that the argument is not null. If it is, it creates an ArgumentNullException instance and throws it. The exception instance is caught in the catch statement, and the error message is printed. Main calls the method twice: once with a null argument, and then with a valid argument. class MyClass { public static void PrintArg(string arg) { try { if (arg == null) Supply name of null argument { ArgumentNullException myEx = new ArgumentNullException("arg"); throw myEx; } Console.WriteLine(arg); } catch (ArgumentNullException e) { Console.WriteLine("Message: {0}", e.Message); } } } class Program { static void Main() { string s = null; MyClass.PrintArg(s); MyClass.PrintArg("Hi there!"); } } This code produces the following output: Message: Value cannot be null. Parameter name: arg Hi there!

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The Swing packages had more big idea changes than little additions here and there. Some smaller-scale changes include the addition of Cursor support to JInternalFrame objects, the addition of fields that can be associated with an Action, and the addition of TableStringConverter, a helper class that lets you convert TableModel cells to an appropriate string representation. There is even a new FileNameExtensionFilter for working with the JFileChooser.

The throw statement can also be used without an exception object, inside a catch block. This form rethrows the current exception, and the system continues its search for additional handlers for it. This form can only be used inside a catch statement. For example, the following code rethrows the exception from inside the first catch clause: class MyClass { public static void PrintArg(string arg) { try { try { if (arg == null) Supply name of null argument { ArgumentNullException myEx = new ArgumentNullException("arg"); throw myEx; } Console.WriteLine(arg); } catch (ArgumentNullException e) { Console.WriteLine("Inner Catch: {0}", e.Message); throw; } } Rethrow the exception, with no additional parameters catch { Console.WriteLine("Outer Catch: Handling an Exception."); } } } class Program { static void Main() { string s = null; MyClass.PrintArg(s); } }

Summary

More-indirect processing by a program is possible with some automatic processing, most likely provided by the compiler One example of this is that a piece of code can be named a specific way to be automatically branched to when a corresponding key is pressed A fourth-generation version involves another level of indirection: it allows code to be named in any way but requires the key to be assigned to that name On an interactive computer, a very different implementation, keystroke processing, has a very straightforward name It processes one keystroke at a time, allowing any key to direct any process In normal interactive mode, the system will automatically send each typewriter key to that user s screen; this is echoing Echoing can be turned off; a good reason to do this is for password entry.

This code produces the following output: Inner Catch: Value cannot be null. Parameter name: arg Outer Catch: Handling an Exception.

What Are Structs Structs Are Value Types Assigning to a Struct Constructors and Destructors Field Initializers Are Not Allowed Structs Are Sealed Boxing and Unboxing Structs As Return Values and Parameters Additional Information About Structs

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