Applications in Java 1.2

1. Applications in Java 1.2 Half Text Half Graphics CS423 (cotter)

2. Swing Components • Defined in package javax.swing • Pure Java components • AWT components tied to local platform GUI • UNIX java windows look like X windows • Windows java windows look like windows windows (??) • etc. • Swing defines a common look and feel for Java. CS423 (cotter)

3. Swing Components • Derive from awt classes java.lang.Object -> java.awt.Component -> jav.awt.Container -> javax.swing.Jcomponent • Methods overloaded in swing to allow different behaviour CS423 (cotter)

4. Product.java / From Java: How to Program - Deitel and Deitel // Calculate the product of three integers import javax.swing.JOptionPane; public class Product { public static void main( String args[] ) { int x, y, z, result; String xVal, yVal, zVal; xVal = JOptionPane.showInputDialog( "Enter first integer:" ); yVal = JOptionPane.showInputDialog( "Enter second integer:" ); zVal = JOptionPane.showInputDialog( "Enter third integer:" ); CS423 (cotter)

5. Product.java x = Integer.parseInt( xVal ); y = Integer.parseInt( yVal ); z = Integer.parseInt( zVal ); result = x * y * z; JOptionPane.showMessageDialog( null, "The product is " + result ); System.exit( 0 ); } } CS423 (cotter)

6. Product Output(s) CS423 (cotter)

7. JOptionPane • Similar to windows message boxes • Types of Option Panes: showConfirmDialog(null,message,title,optionType,msgType); Asks a confirming question, like yes/no/cancel. showInputDialog(message); Prompt for some input. showMessageDialog(null, message); Tell the user about something that has happened. showOptionDialog(....); The Grand Unification of the above three. CS423 (cotter)

8. OptionType • DEFAULT_OPTION • YES_NO_OPTION • YES_NO_CANCEL_OPTION • OK_CANCEL_OPTION CS423 (cotter)

9. messageType • ERROR_MESSAGE • INFORMATION_MESSAGE • WARNING_MESSAGE • QUESTION_MESSAGE • PLAIN_MESSAGE CS423 (cotter)