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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.

eed to access a database Since the original JDBC API was added to JDK 1.1, the JDBC API has offered support for connecting your Java programs to SQL-based data sources. And, while JDBC is not an acronym for Java Database Connectivity (at least according to Sun), what you may be tired of doing with JDBC is loading database drivers. One of the many new features added to Mustang is the ability to access JDBC connections without having to explicitly load the driver, provided it is packaged properly. As Tables 5-1 and 5-2 show, the java.sql package has grown quite a bit, while javax.sql and its subpackages have barely grown at all.

Structs are programmer-defined data types, very similar to classes. They have data members and function members. Although similar to classes, there are a number of important differences. The most important ones are the following: Classes are reference types and structs are value types. Structs are implicitly sealed, which means that they cannot be derived from. The syntax for declaring a struct is similar to that of declaring a class. Keyword struct StructName { MemberDeclarations } For example, the following code declares a struct named Point. It has two public fields, named X and Y. In Main, three variables of struct type Point are declared, and their values are assigned and printed out. struct Point { public int X; public int Y; } class Program { static void Main() { Point first, second, third; first.X second.X third.X third.Y = = = = 10; first.Y = 10; 20; second.Y = 20; first.X + second.X; first.Y + second.Y; {0}, {1}", first.X, first.Y); {0}, {1}", second.X, second.Y); {0}, {1}", third.X, third.Y);

Console.WriteLine("first: Console.WriteLine("second: Console.WriteLine("third: } }

5.0 6.0

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.

As with all value types, a variable of a struct type contains its own data. Consequently A variable of a struct type cannot be null. Two structs variables cannot refer to the same object. For example, the following code declares a class called CSimple, and a struct called Simple, and a variable of each. Figure 12-1 shows how the two would be arranged in memory. class CSimple { public int X; public int Y; } struct Simple { public int X; public int Y; } class Program { static void Main() { CSimple cs = new CSimple(); Simple ss = new Simple(); ...