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These are very familiar, but it s useful to run down this range of interactions in a specific way. The simplest interaction through a mouse is the ability to point and click to point to something on the screen and click on it. Related to the keyboard, the simplest use of this is to point at some text and click to move the cursor to that point. This ability is standard in any text entry area of the screen. The way to show available directives closest to the keyboard version is to click on drop-down menu headers. This design allows several menus to be viewed at nearly the same time and, so, for a single partitioned menu to be separated into multiple simple menus. The pointer can then be dragged down any of the menus to select a directive. But, of course, the ability to click on a picture or symbol of something an icon is a prominent benefit of pixels. One use of an icon is as a piece of information; clicking on the icon selects it, putting that information into focus, making it the subject of applicable menu directives. It s easy to see that moving a cursor is actually an example of setting a focus. For another use, an icon makes an available directive more immediately obvious, which generally makes the user more comfortable. And, of course, double-clicking on an icon is the equivalent of entering a directive. For example, double-clicking on a data file directs to open it with its default application, and double-clicking on an application directs to open a new (or default) data file with that application.

For example, the code in Figure 13-2 shows two equivalent declarations of enum TrafficLight. The code on the left accepts the default type and numbering. The code on the right explicitly sets the underlying type to int and the members to values corresponding to the default values.

Note The examples in this chapter are purposely just code snippets, not complete programs. This was

You can explicitly assign the values for any of the member constants. If you don t initialize a member constant, the compiler implicitly assigns it a value. The rules the compiler uses for assigning those values are illustrated in Figure 13-3. The values associated with the member names do not need to be distinct.

The next operation related to the keyboard is the ability to point at one position in some text and drag to another position, to select all of the text in between (putting it into focus). This can be applied to selecting multiple icons, as well. The ability to drag and drop to drag a selection into another position on the screen (in an icon or some text) represents a directive to move (or copy) an item. It can also represent a focus and direct at the same time setting the focus and directing something on it, like opening with a specific application or printing to a specific printer. The GUI version of a form has the same features as the keyboard-only version, enhanced from the ability to point and click. Text entry fields have the standard editing features; multiple-option lists have small buttons with two appearances, one for single- and another for multiple-choice. A GUI form also provides much more visual variety. For example, choice from a range can also be represented by a sliding box on a horizontal or vertical bar, or up and down arrows next to a number. A complex form can also be partitioned into a categorized multiform, in which only one category is visible at a time; this is typically represented by some arrangement of tabs, each with short text.

done to avoid spending too much time in setup of your system and identifying whether all the features are supported with your installed database selection, in favor of actually learning what s new and different with Java 6.

Figure 13-3. The algorithm for assigning member values For example, the following code declares two enumerations. CardSuit accepts the implicit numbering of the members, as shown in the comments. FaceCards sets some members explicitly and accepts implicit numbering of the others. enum CardSuit { Hearts, Clubs, Diamonds, Spades, MaxSuits } enum FaceCards { // Member Jack = 11, Queen, King, Ace, NumberOfFaceCards = 4, SomeOtherValue, HighestFaceCard = Ace }

// // // // // //

The java.sql package is the primary package for JDBC. It offers the main classes for interacting with your data sources. Since the changes to javax.sql are so small, I ll cover the two together. The new features in these packages for Mustang include changes in the following areas: Database driver loading Exception handling improvements Enhanced BLOB/CLOB functionality Connection and statement interface enhancements National character set support SQL ROWID access SQL 2003 XML data type support Annotations