Java Programming Tutorial - 2 - Running a Java Program

Creating Your First Application

Your first application, HelloWorld, will simply display the greeting "Hello world!". To create this program, you will: 

• Create a source file
  A source file contains code, written in the Java programming language, that you and other programmers can understand. You can use any text editor to create and edit source files.
• Compile the source file into a .class file
  The Java programming language compiler (javac) takes your source file and translates its text into instructions that the Java virtual machine can understand. The instructions contained within this file are known as bytecodes.
• Run the program
  The Java application launcher tool (java) uses the Java virtual machine to run your application.

via [download.oracle.com]

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