AWT-Abstract Window Toolkit

AWT

• Java AWT (Abstract Window Toolkit) is an API to develop GUI or window-based applications in java.

AWT Classes

• To design GUI applications java provides us different class.
• These classes are defined in package java.awt and its sub packages.
• We can group these classes in different categories.
1. Components
2. Containers
3. Layout managers
4. Graphical...etc

Awt-Components

• To accept user input awt provides us different classes.
• Awt Component classes are
• Button
• TextField
• Label
• Checkbox
• Choice
• List...etc
• All these component classes are derived from comman base class Component.

Awt-Containers

• A Container is as object which contains awt-components in it.
• Awt provides us different container classes such as

1. Frame
2. Dialog
3. Panel
4. Applet
• All these container classes are derived from base class Container.
• A Component can be added into container by using method add(Component).

Layout-Managers

• A layout manager is an object which arranges components in a container.
• Every Container have a LayoutManger attached with it.
• The job of the layout manager is to arrange the components which are added into container. i.e. it decides size & position of each Component.
• Awt provides us different layout manager classes such as
• FlowLayout
• GridLayout
• BorderLayout
• CardLayout
• All these layout managers are derived from base class LayoutManager.
• A layout Manager of Container can be changed by calling method setLayout(LayoutManager lm) of class Container.

Windows Applications

• These are standalone GUI applications.
• These applications can be directly executed from our command prompt.
• They don't require Applet Container like applets to execute them
• For ex: java demoapp