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Setting Up Your Java Environment and Hello World Program

This guide provides a comprehensive overview of setting up your Java development environment and creating your first Hello World program. You'll learn Java's case sensitivity, the importance of keywords and statement termination with semicolons, and the structure of the main method as the application's starting point. Additionally, the tutorial highlights key resources for Java development including IDEs like Eclipse and NetBeans, and provides step-by-step instructions for downloading the Java SDK, adjusting your system's path variables, and navigating environment settings on both Windows and Unix systems.

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Setting Up Your Java Environment and Hello World Program

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  1. CS7 Recitation Cem Akkaya

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

  3. HelloWorld //HelloWorld program public class Hello { public static void main(String[] args) { System.out.println(“Hello World") ; } } • 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)

  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

  6. Upload Example

  7. 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

  8. 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.

  9. Questions ?

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