CS7 Recitation Cem Akkaya

Outline  Homework-0 in detail  Useful links and tools  Setting up your java environment

HelloWorld  java is case sensitive  Key words are reserved  main method is the starting point of each application  each statement ends with a semicolon  when you open a brace, you have to close it  the name of the java file has to be exactly the same as the class name (e.g. Hello.java) //HelloWorld program public class Hello { public static void main(String[] args) { System.out.println(“Hello World") ; }

HelloWorld  A program consists of binary instructions, which are executed by CPU  Two steps to transform our source code in machine instructions (machine language) Figure from Java

HelloWorld  Java VM allows the same application (.class files) to run on multiple platforms - platform indepence Figure from Java

Upload Example

Useful Links & Tools  Sun Developer Network ( java.sun.com) java.sun.com API Documentation ( Tutorial ( Google  Integrated Development Environments (IDEs) Eclipse ( NetBeans ( java.sun.com) java.sun.com jGrasp ( Notepad++ ( - not a IDEhttp://notepad-plus.sourceforge.net/

Setting up java environment  Download and install Java SDK from  Update the path environment variable Windows Command Prompt (changes effective for session)  “set path=JAVA_DIR\bin”  “set path= %path%;JAVA_DIR\bin” Windows Control Panel (changes are permanent)  Over Control Panel-Performance and Maintenance- System-Advanced-Environment Variables In Unix systems setting environment variables is shell specific.

Questions ?