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User-defined conversions are discussed in greater detail in 18, but I will mention them here as well because they are operators. You can define both implicit and explicit conversions for your own classes and structs. This allows you to convert an object of your user-defined type to some other type, and vice versa. C# provides implicit and explicit conversions. With an implicit conversion, the compiler will automatically make the conversion, if necessary, when it is resolving what types to use in a particular context. With an explicit conversion, the compiler will only make the conversion when an explicit cast operator is used. The syntax for declaring an implicit conversion is the following. The public and static modifiers are required for all user-defined conversions. Required Target Source public static implicit operator TargetType ( SourceType Identifier ) { ... return ObjectOfTargetType; } The syntax for the explicit conversion is the same, except that explicit is substituted for implicit. The following code shows an example of declarations for conversion operators that will convert an object of type LimitedInt to type int, and vice versa. class LimitedInt Target Source { public static implicit operator int (LimitedInt li) { return li.TheValue; } Target Source public static implicit operator LimitedInt (int x) { LimitedInt li = new LimitedInt(); li.TheValue = x; return li; } private int _TheValue = 0; public int TheValue{ ... } }

CHAPTER TWO #

For example, the following code reiterates and uses the two type conversion operators just defined. In Main, an int literal is converted into a LimitedInt object, and in the next line, a LimitedInt object is converted into an int. class LimitedInt { const int MaxValue = 100; const int MinValue = 0; public static implicit operator int(LimitedInt li) { return li.TheValue; } public static implicit operator LimitedInt(int x) { LimitedInt li = new LimitedInt(); li.TheValue = x; return li; } private int _TheValue = 0; public int TheValue { get { return _TheValue; } set { if (value < MinValue) _TheValue = 0; else _TheValue = value > MaxValue MaxValue : value; } } } class Program { static void Main() { LimitedInt li = 5; int Five = li; // Convert type

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Dimension dim = tray.getTrayIconSize(); BufferedImage bi = new BufferedImage( dim.width, dim.height, BufferedImage.TYPE_INT_RGB); Graphics g = bi.getGraphics(); // then draw on image before associating with tray icon TrayIcon trayIcon = new trayIcon(bi, text, popup);

Console.WriteLine("li: {0}, Five: {1}", li.TheValue, Five); } }

his chapter describes a comprehensive set of simple function-oriented designing philosophies and a dynamic overall strategy for applying them in various situations.

Top-level pop-up windows in Java-speak are called dialog boxes. They aren t the main windows (frames) of an application; they re typically used to interact with a user either to display a message or accept user input. Pre-Mustang, dialog boxes were by default modeless, with an option to be modal. When a dialog box was modal, other windows of the application were blocked from accepting input, unless the window had the dialog box as its owner. Once the user reacted to the dialog accordingly, by entering the input or just closing the dialog, input to other windows of the application became accessible again. That is basically the limitations of modality with predecessors to Mustang. Along comes Java 6 and you have more options. No longer are you limited in scope to one level of modality (on or off). Now you have four distinct settings, defined by the new Dialog.ModalityType enumeration, whose types are shown in Table 4-3.

The preceding example code showed the implicit conversion of the int to a LimitedInt type and the implicit conversion of a LimitedInt type to an int. If, however, you had declared the two conversion operators as explicit, you would have had to explicitly use cast operators when making the conversions. A cast operator consists of the name of the type to which you want to convert the expression, inside a set of parentheses. For example, in the following code, method Main casts the value 5 to a LimitedInt object. Cast operator LimitedInt li = (LimitedInt) 5; For example, here is the relevant portion of the code, with the changes marked: public static explicit operator int(LimitedInt li) { return li.TheValue; } public static explicit operator LimitedInt(int x) { LimitedInt li = new LimitedInt(); li.TheValue = x; return li; } static void Main() { LimitedInt li = (LimitedInt) 5; int Five = (int) li; Console.WriteLine(" li: {0}, Five: {1}", li.TheValue, Five); } In both versions of the code, the output is the following:

li: 5, Five: 5

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