You can do this from the Start menu by choosing Run. class Fileīring up a shell, or 'command,' window. The Save As dialog just before you click Save. When you're finished, the dialog box should look like In the Encoding combo box, leave the encoding as ANSI.From the Save as type combo box, choose Text Documents (*.txt).In the File name text field, type 'HelloWorldApp.java', without the quotation marks.In this example, the directory is myapplication on the C drive. Using the Save in combo box, specify the folder (directory) where you'll save your file.To do this in Notepad, first choose the File > Save As. Save the code in a file with the name HelloWorldApp.java. HelloWorldApp is not the same as helloworldapp. Both the compiler ( javac) and launcher ( java) are case-sensitive, so you must capitalize consistently. Note: Type all code, commands, and file names exactly as shown. In a new document, type in the following code: You can launch the Notepad editor from the Start menu by selecting Programs > Accessories > Notepad. Or, you can use the following (longer) instructions.įirst, start your editor. Then, you can go straight to Compile the Source File into a. You can save the file HelloWorldApp.java on your computer and avoid a lot of typing. To create a source file, you have two options: The Java application launcher tool ( java) uses the Java virtual machine to run your application. The instructions contained within this file are known as bytecodes. The Java programming language compiler ( javac) takes your source file and translates its text into instructions that the Java virtual machine can understand. You can use any text editor to create and edit source files.Ĭompile the source file into a. To create this program, you will:Ī source file contains code, written in the Java programming language, that you and other programmers can understand. Your first application, HelloWorldApp, will simply display the greeting 'Hello world!'.

These two items are all you'll need to write your first application. You can easily adapt these instructions if you use a different text editor. In this example, we'll use Notepad, a simple editor included with the Windows platforms.

(Make sure you download the JDK, not the JRE.) Consult the To write your first program, you'll need:ĭownload the Windows version now. If you encounter problems with the instructions on this page, consult the 'Hello World!' for Solaris OS, Linux, and Mac OS X and It's time to write your first application! The following instructions are for users of Windows Vista, Windows 7, and Windows 8.

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