Gu iintro(java)
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The document discusses GUI programming concepts in Java. It covers the basics of event-driven programming using Swing components like JLabel, JButton etc. It explains how to create a simple GUI application using a JFrame container, adding components, registering event listeners and writing event handler methods. The key aspects are creating Swing components, adding them to containers using layout managers, registering listeners and writing code to handle events like button clicks.
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Gu iintro(java)
- 1. GUI Programming in Java Tim McKenna [email_address]
- 2. GUI Programming Concepts conventional programming: sequence of operations is determined by the program what you want to happen, happens when you want it event-driven programming: sequence of operations is determined by the user ’s interaction with the application’s interface anything that can happen, happens at any time
- 3. GUI Design Concepts a wealth of information creates a poverty of attention - Herbert Simon Principles of good GUI Design IBM's Design concepts Saul Greenberg's HCI pages Tim's HCI notes
- 4. GUI Programming Concepts in Java Java GUI ("Swing") has components Windows GUI has controls Unix GUI has widgets examples: labels, buttons, check boxes, radio buttons, text input boxes, pull down lists Java Swing components: JLabel, JButton, JCheckBox, JRadioButton, JTextField, JTextArea, JComboBox
- 5. Java GUI history: the AWT AWT(JDK 1.0, 1.1): Abstract Window Toolkit package: java.awt, java.awt.event heavyweight components using native GUI system elements used for applets until most browsers supported JRE 1.2
- 6. Swing in Java Swing(Java 2, JDK 1.2+) lightweight components that do not rely on the native GUI or OS “ look and feel” of Swing components are identical on different platforms can be customized Swing inherits from AWT AWT still used for events, layouts
- 7. Swing Components in Java advanced GUI support. e.g. drag-and-drop package names: javax.swing, javax.swing.event components inherit from JComponent components are added to a top-level container: JFrame, JDialog, or JApplet.
- 8. running a Swing application java -Dswing.aatext=true MySwingClass the option sets the system property "swing.aatext" to "true" to enable anti-aliasing for every JComponent javaw runs a GUI without the console window e.g. HelloWorldSwing.java
- 9. Basic GUI Programming Steps in Java declare a container and components add components to one or more containers using a layout manager register event listener(s) with the components create event listener method(s)
- 10. Basic GUI Programming Concepts in Java Example: JFrameDemoTM.java, JFrameDemoTM2.java, JFrameDemo.java container : a screen window/applet window/panel that groups and arranges GUI components GUI component: an object with visual representation Swing containers: JFrame, JApplet, JPanel AWT containers: Frame, Applet, Panel
- 11. GUI Programming: The Java Approach event-driven programming a piece of code (i.e. event handler ) is attached to a GUI component an event handler is called when an event (e.g. a mouse click) is activated / fired The Delegation Event Model in Java processing of an event is delegated to an object (the listener) in the program
- 12. Event-driven Programming in Java event source: a GUI component that generates / fires an event event: a user interaction (e.g. a click on the button) event listener: an object that has implemented event handlers to react to an event
- 13. Event Handling in Java the delegation event model - event listeners must be registered with an event source in order to receive notification
- 14. Event Handling in Java registration of an event listener - write a class that implements an [ event type]Listener interface - create an instance of that class (i.e. an event listener) - register the listener with a GUI component: add[event type]Listener ( <an event listener> )
- 15. Event Handling in Java a listener interface has a list of standard event handlers (i.e. methods) API documentation - java.awt.event - event classes - listener interfaces - adapter classes
- 16. Event Handling in Java different ways of coding the event listeners JFrameDemoTM.java uses named inner classes. JFrameDemoTM2.java uses named inner classes and shows how to consolidate window closing from two different events. JFrameDemo.java does not use inner classes.