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AWT - Overview
AWT - Overview
Graphical User Interface
Graphical User Interface (GUI) offers user interaction via some graphical components. For example our underlying Operating System also offers GUI via window,frame,Panel, Button, Textfield, TextArea, Listbox, Combobox, Label, Checkbox etc. These all are known as components. Using these components we can create an interactive user interface for an apppcation.
GUI provides result to end user in response to raised events.GUI is entirely based events. For example cpcking over a button, closing a window, opening a window, typing something in a textarea etc. These activities are known as events.GUI makes it easier for the end user to use an apppcation. It also makes them interesting.
Basic Terminologies
| Term | Description |
|---|---|
| Component | Component is an object having a graphical representation that can be displayed on the screen and that can interact with the user. For examples buttons, checkboxes, pst and scrollbars of a graphical user interface. |
| Container | Container object is a component that can contain other components.Components added to a container are tracked in a pst. The order of the pst will define the components front-to-back stacking order within the container. If no index is specified when adding a component to a container, it will be added to the end of the pst. |
| Panel | Panel provides space in which an apppcation can attach any other components, including other panels. |
| Window | Window is a rectangular area which is displayed on the screen. In different window we can execute different program and display different data. Window provide us with multitasking environment. A window must have either a frame, dialog, or another window defined as its owner when it s constructed. |
| Frame | A Frame is a top-level window with a title and a border. The size of the frame includes any area designated for the border. Frame encapsulates window. It and has a title bar, menu bar, borders, and resizing corners. |
| Canvas | Canvas component represents a blank rectangular area of the screen onto which the apppcation can draw. Apppcation can also trap input events from the use from that blank area of Canvas component. |
Examples of GUI based Apppcations
Following are some of the examples for GUI based apppcations.
Automated Teller Machine (ATM)
Airpne Ticketing System
Information Kiosks at railway stations
Mobile Apppcations
Navigation Systems
Advantages of GUI over CUI
GUI provides graphical icons to interact while the CUI (Character User Interface) offers the simple text-based interfaces.
GUI makes the apppcation more entertaining and interesting on the other hand CUI does not.
GUI offers cpck and execute environment while in CUI every time we have to enter the command for a task.
New user can easily interact with graphical user interface by the visual indicators but it is difficult in Character user interface.
GUI offers a lot of controls of file system and the operating system while in CUI you have to use commands which is difficult to remember.
Windows concept in GUI allow the user to view, manipulate and control the multiple apppcations at once while in CUI user can control one task at a time.
GUI provides multitasking environment so as the CUI also does but CUI does not provide same ease as the GUI do.
Using GUI it is easier to control and navigate the operating system which becomes very slow in command user interface. GUI can be easily customized.