Once you have chosen and laid outthese components, you must make the events interactive by making themrespond to various user events such as button clicks or mouse movements.Thereare many predefined components, but you can also definecomponents that draw custom two-dimensional graphics, including animations.Atthe end of this chapter, we will reimplement a basic version ofthe DrawingPanel class from Supplement 3G.14.6 Case Study: ImplementingDrawingPanel Initial Version without Events Second Version with Events822
A realgraphical user interface includes window frames which you create thatcontain buttons, text input fields, and other onscreen components.A major part of creating a graphical user interface in Java is figuring outhow to position and lay out the components of the user interface tomatch the appearance you desire. Supplement 3G introduceda DrawingPanel class that allowed you to draw two-dimensional graphicson the screen.This class is useful for certain applications, but writing aGUI is not the same as drawing shapes and lines onto a canvas.
M14_REGE1813_02_SE_C14.qxd 2/10/10 3:43 PM Chapter14Graphical User Interfaces14.1 GUI Basics Graphical Input and Outputwith Option Panes Working with Frames Buttons, Text Fields, and Labels Changing a Frame’s Layout Handling an Event14.2 Laying Out Components Layout Managers Composite Layouts14.3 Interaction betweenComponents Example 1: BMI GUI Object-Oriented GUIs Example 2: Credit Card GUI14.4 Additional Componentsand Events Text Areas, Scrollbars, and Fonts Icons Mouse Events14.5 Two-DimensionalGraphics Drawing onto Panels Animation with TimersIntroductionIn this chapter we will explore the creation of graphical user interfaces(GUIs).Although console programs like the ones we have written in thepreceding chapters are still very important, the majority of modern desktopapplications have graphical user interfaces.
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