free visual basic barcode generator A Sampling of AWT Classes in Java

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A Sampling of AWT Classes
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I n t r o d u c i n g t h e A W T: Wo r k i n g w i t h W i n d o w s , G r a p h i c s , a n d Te x t
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Class Graphics GraphicsDevice GraphicsEnvironment GridBagConstraints GridBagLayout GridLayout Image Insets Label List MediaTracker Menu MenuBar MenuComponent MenuItem MenuShortcut Panel Point Polygon PopupMenu PrintJob Rectangle Robot Scrollbar ScrollPane SystemColor TextArea TextComponent TextField Toolkit Window TABLE 23-1
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Description Encapsulates the graphics context This context is used by the various output methods to display output in a window Describes a graphics device such as a screen or printer Describes the collection of available Font and GraphicsDevice objects Defines various constraints relating to the GridBagLayout class The grid bag layout manager Grid bag layout displays components subject to the constraints specified by GridBagConstraints The grid layout manager Grid layout displays components in a two-dimensional grid Encapsulates graphical images Encapsulates the borders of a container Creates a label that displays a string Creates a list from which the user can choose Similar to the standard Windows list box Manages media objects Creates a pull-down menu Creates a menu bar An abstract class implemented by various menu classes Creates a menu item Encapsulates a keyboard shortcut for a menu item The simplest concrete subclass of Container Encapsulates a Cartesian coordinate pair, stored in x and y Encapsulates a polygon Encapsulates a pop-up menu An abstract class that represents a print job Encapsulates a rectangle Supports automated testing of AWT-based applications Creates a scroll bar control A container that provides horizontal and/or vertical scroll bars for another component Contains the colors of GUI widgets such as windows, scroll bars, text, and others Creates a multiline edit control A superclass for TextArea and TextField Creates a single-line edit control Abstract class implemented by the AWT Creates a window with no frame, no menu bar, and no title
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A Sampling of AWT Classes (continued)
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Although the basic structure of the AWT has been the same since Java 10, some of the original methods were deprecated and replaced by new ones For backward-compatibility, Java still supports all the original 10 methods However, because these methods are not for use with new code, this book does not describe them
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The AWT defines windows according to a class hierarchy that adds functionality and specificity with each level The two most common windows are those derived from Panel, which is used by applets, and those derived from Frame, which creates a standard application window Much of the functionality of these windows is derived from their parent classes Thus, a description of the class hierarchies relating to these two classes is fundamental to their understanding Figure 23-1 shows the class hierarchy for Panel and Frame Let s look at each of these classes now
Component
At the top of the AWT hierarchy is the Component class Component is an abstract class that encapsulates all of the attributes of a visual component All user interface elements that are displayed on the screen and that interact with the user are subclasses of Component It defines over a hundred public methods that are responsible for managing events, such as mouse and keyboard input, positioning and sizing the window, and repainting (You already used many of these methods when you created applets in s 21 and 22) A Component object is responsible for remembering the current foreground and background colors and the currently selected text font
Container
The Container class is a subclass of Component It has additional methods that allow other Component objects to be nested within it Other Container objects can be stored inside of a Container (since they are themselves instances of Component) This makes for a multileveled containment system A container is responsible for laying out (that is, positioning) any
FIGURE 23-1
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