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CS7 Recitation
Cem Akkaya
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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 programpublic 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 Tutorial @ http://java.sun.com
HelloWorld Java VM allows the same application (.class
files) to run on multiple platforms - platform indepence
Figure from Java Tutorial @ http://java.sun.com
Upload Example
Useful Links & Tools Sun Developer Network (http://java.sun.com)
API Documentation (http://java.sun.com/javase/6/docs/api/) Tutorial (http://java.sun.com/docs/books/tutorial/) Google
Integrated Development Environments (IDEs) Eclipse (http://www.eclipse.org/) NetBeans (http://java.sun.com) jGrasp (http://www.jgrasp.org/) Notepad++ (http://notepad-plus.sourceforge.net/) - not
a IDE
Setting up java environment Download and install Java SDK from
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.
Questions ?