CH12 - Chapter 12 Java an Introduction to Computer...

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Unformatted text preview: Chapter 12 Java: an Introduction to Computer Science & Programming - Walter Savitch Chapter 12 ● Event-Driven Programming and GUIs ● Swing Basics and a Simple Demo Program ● Layout Managers ● Buttons and Action Listeners ● Container Classes ● Text I/O for GUIs ● Inner Classes Window Interfaces Using Swing Objects Chapter 12 Java: an Introduction to Computer Science & Programming - Walter Savitch Swing ● Special library of classes that allows Java programs to have a windowing interface ● Part of larger collection called Java Foundation Classes or JFC ● An improved version of older library called Abstract Window Toolkit ( AWT ) ● Standard part of all versions of Java 2 (JDK 1.2) Chapter 12 Java: an Introduction to Computer Science & Programming - Walter Savitch GUIs—Graphical User Interfaces Most modern programs use a GUI GUI (pronounced “gooey”): ● G raphical—not just text or characters: windows, menus, buttons, etc. ● U ser—person using the program ● I nterface—way to interact with the program Typical graphical elements: ● Window —portion of screen that serves as a smaller screen within the screen ● Menu —list of alternatives offered to user ● Button —looks like a button that can be pressed Chapter 12 Java: an Introduction to Computer Science & Programming - Walter Savitch Event-Driven Programming ● Programs with GUIs often use Event-Driven Programming ● Program waits for events to occur and then responds ● Examples of events: » Clicking a mouse button » Dragging the mouse » Pressing a key on the keyboard ● Firing an event —when an object generates an event ● Listener —object that waits for events to occur ● Event handler —method that responds to an event Chapter 12 Java: an Introduction to Computer Science & Programming - Walter Savitch A New Approach to Programming Previous Style of Programming: ● List of instructions performed in order ● Next thing to happen is next thing in list ● Program performed by one agent—the computer Event-Driven Style of Programming: ● Objects that can fire events and objects that react to events ● Next thing to happen depends on next event ● Program is interaction between user and computer Chapter 12 Java: an Introduction to Computer Science & Programming - Walter Savitch Very Simple Swing Demonstration import javax.swing.*; public class FirstSwingDemo { public static final int WIDTH = 300; public static final int HEIGHT = 200; public static void main(String args) { JFrame myWindow = new JFrame(); myWindow.setSize(WIDTH, HEIGHT); JLabel myLabel = new JLabel(“Please don’t…”); myWindow.getContentPanel().add(myLabel); WindowDestroyer myListener = new WindowDestroyer(); myWindow.addWindowListener(myListener); myWindow.setVisible(true); } } Chapter 12 Java: an Introduction to Computer Science & Programming - Walter Savitch Notes on the Simple Demo Program import javax.swing.*; public class FirstSwingDemo { public static final int WIDTH = 300;...
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This note was uploaded on 04/17/2008 for the course COMP SCI 201 taught by Professor Durga during the Spring '08 term at Wentworth Institute of Technology.

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CH12 - Chapter 12 Java an Introduction to Computer...

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