CS 111 - Introduction to Computer Science Eclipse Hello World Tutorial

This tutorial walks you through the process of creating your first "Hello, world!" application (http://en.wikipedia.org/wiki/Hello_world_program) in Java.

• Open Eclipse:
  •  Start a terminal window by dragging to the bottom of the screen and selecting “Terminal Emulator”.
  •  In that terminal window, type “eclipse &”.
  •  Wait for Eclipse to start up.  Do not download/upgrade anything if asked.  If you do not go to the Workbench automatically, select Workbench (“Go to workbench”).
  •  If you're not already in the Java perspective, in the main menu select Window → Open Perspective → Java.
• Create a Java Project:
  • Before creating a Java class, we need a project to put it in.  In the main menu, select File → New → Java Project.
  • Enter “hw1” for the project name.
  • Under “Project Layout”, you should have selected “Use project folder as root for sources and class files”.  If this is not selected:
    • Click the “Configure defaults” link for Project Layout.
    • Under “Source and output folder”, select “Project”.
    • Click “Apply” and “OK”.
    • Make sure you now have selected “Use project folder as root for sources and class files” under “Project Layout” on the previous screen.
  • Click “Finish”.
• Create a Java Class:
  • In the main menu, select File →  New →  Class.
  • Under Source Folder, enter the name of your project (“hw1”).
  • Under Package, enter nothing.  Eclipse will warn you that using the default package is not recommended, but for our purposes, you should always use the default package.
  • Under Name, enter “Hello”. Case matters.  Class names should generally start with a capital letter, along with first letters of subsequent words (with no spaces in between).
  • Under “Which method stubs would you like to create?”, check “public static void main(String[] args)”.
  • Click “Finish”
• Write the program code:
  • Within the main method curly brackets, add the following line:
    System.out.println("Hello, world!");
  •  Save your changes (Control-S); the class will automatically compile.
  • Click the green right-arrow Play button to run the program in the bottom console window.

Congratulations! You have successfully created your first "Hello, world!" application!