• Announce

• Linked Property Makes WWW What it is Today
• HTML Structures
• Tags (Note: The tags are case insensitive)
• Ordered Lists; Unordered Lists
• Tables
• Links (Anchors)
• Text Formatting
• Carriage Returns
• Images

• Object Oriented Programming
  • Treats everything as an Object
  • Object has Data and Functions (Methods)
  • Class Describes an Object in Java
• Two Ways of Using Java
  • Stand Alone (like most traditional programs)
  • Using Web with an Applet (for this class)
• Example: "Hello World", Things to Note:
  • Program is a class
  • Class contains data and methods
  • Method init() always started for applets
  • add statements (layout)
  • Applet invoked through HTML file
  • Program tested with Web Browser or appletviewer
• Demonstrate Use of Buttons; Important Pieces:
  • actionPerformed method
  • events, cause
  • if statements
• String Variables
• Reading Data Into Your Program: Input
  • The TextField Class
  • Example: Read In and Duplicate Demo .getText
• If Statements; If - Else Statements
• Logical Expression
• Assignment Statement
• Method Invocation
• Using Decisions to Solve Problems
• Example: A Number Guessing Game
  • Binary Search
• Decision Trees
• Example: Car Diagnosis Problem: Decision Tree
  • Review Code Noting myLocation Variable
• Using Primitive Data Types: Integers
• Example: Doing Multiple Tallies

• The String Class

  Declaration: String message;

  String Constant: "Good Morning World!"

  String Assignment: message = "It's Friday";

• String Class Has Many Methods for Manipulation
  • int length()
  • int indexOf(String st)
  • String substring(int start, int end)
• Exchanging the Contents of Two Variables
  • An Algorithm: The Exchange Problem
• More About Syntax

  
   <name> ==> any string of alphanumeric symbols that begins with a letter
   <statement> ==> <name> = <expression> ;
   <statement> ==> <name> = new <class>(<arguments>);
   <statement> ==> <name>.<method>(<arguments>) | <method>(<arguments>) ;
   <arguments> == possibly empty list of <expression>s separated by commas
   <expression> ==> <string-expression> | <int-expression> | <oth-expression>
   <string-expression> ==>  <string-expression> + <string-expression>
   <string-expression> ==>  <string>
   <string> ==> " any sequence of characters "
   <string> ==> <name>
  
  

• Need More: Example involving compound statement:

  
  11. <method> ==> setText | getText | getInt | setInt |
                         add | actionPerformed | init
  
  12. <compound-statement> ==> {
                                  list of <statement>s
                               }
  
  13. <statement> ==> if (<bool-expression>)
                         <compound-statement>
  
  14. <statement> ==> if (<bool-expression>)
                         <compound-statement>
                      else
                         <compound-statement>
  

3 Numerical Computation and the Study of Functions