1. CS7 Recitation Cem Akkaya

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

3. 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") ; }

4. 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 Tutorial @ http://java.sun.com

5. HelloWorld  Java VM allows the same application (.class files) to run on multiple platforms - platform indepence Figure from Java Tutorial @ http://java.sun.com

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7. Useful Links & Tools  Sun Developer Network ( http:// java.sun.com) http:// java.sun.com API Documentation (http://java.sun.com/javase/6/docs/api/)http://java.sun.com/javase/6/docs/api/ Tutorial (http://java.sun.com/docs/books/tutorial/)http://java.sun.com/docs/books/tutorial/ Google  Integrated Development Environments (IDEs) Eclipse (http://www.eclipse.org/)http://www.eclipse.org/ NetBeans ( http:// java.sun.com) http:// java.sun.com jGrasp (http://www.jgrasp.org/)http://www.jgrasp.org/ Notepad++ (http://notepad-plus.sourceforge.net/) - not a IDEhttp://notepad-plus.sourceforge.net/

8. Setting up java environment  Download and install Java SDK from http://java.sun.com/ http://java.sun.com/  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.

9. Questions ?