How To Compile And Run Java Program In Windows 7
It'southward time to write your outset application! The following instructions are for users of Windows Vista, Windows 7, and Windows 8. Instructions for other platforms are in "Howdy World!" for Solaris OS, Linux, and Mac OS X and "Hello World!" for the NetBeans IDE.
If y'all meet problems with the instructions on this page, consult the Common Problems (and Their Solutions).
- A Checklist
- Creating Your Commencement Application
- Create a Source File
- Compile the Source File into a
.classFile - Run the Program
A Checklist 
To write your first program, y'all'll demand:
-
The Java SE Development Kit 8 (JDK 8)
You can download the Windows version at present. (Brand sure you download the JDK, not the JRE.) Consult the installation instructions.
-
A text editor
In this example, we'll use Notepad, a simple editor included with the Windows platforms. You tin can easily arrange these instructions if you employ a unlike text editor.
These two items are all you'll demand to write your commencement application.
Creating Your First Application
Your get-go awarding, HelloWorldApp, will only brandish the greeting "Hi globe!". To create this programme, you volition:
-
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 plan
The Coffee application launcher tool (
coffee) uses the Java virtual auto to run your application.
Create a Source File
To create a source file, you have ii options:
-
You can save the file
HelloWorldApp.java.courseFile. -
Or, you tin can use the following (longer) instructions.
First, start your editor. You can launch the Notepad editor from the Start menu by selecting Programs > Accessories > Notepad. In a new document, type in the post-obit code:
/** * The HelloWorldApp class implements an application that * but prints "Hello World!" to standard output. */ class HelloWorldApp { public static void main(Cord[] args) { Organization.out.println("Hello World!"); // Display the string. } } Be Careful When You Type 
Note: Blazon all code, commands, and file names exactly as shown. Both the compiler (javac) and launcher (java) are case-sensitive, then you must capitalize consistently.
HelloWorldApp is not the same as helloworldapp.
Salvage the code in a file with the name HelloWorldApp.java. To practise this in Notepad, first cull the File > Save Every bit ... menu detail. Then, in the Relieve Equally dialog box:
- Using the Save in combo box, specify the folder (directory) where yous'll save your file. In this instance, the directory is
myapplicationon theCdrive. - In the File name text field, type
"HelloWorldApp.java", without the quotation marks. - From the Save as type combo box, choose Text Documents (*.txt).
- In the Encoding combo box, leave the encoding every bit ANSI.
When you're finished, the dialog box should wait like this.
The Salve As dialog just before you click Save.
Now click Save, and exit Notepad.
Compile the Source File into a .class File
Bring up a beat out, or "command," window. You can do this from the First menu by choosing Run... and so entering cmd. The trounce window should look similar to the following figure.
A shell window.
The prompt shows your electric current directory. When y'all bring upward the prompt, your current directory is usually your home directory for Windows XP (as shown in the preceding figure.
To compile your source file, change your current directory to the directory where your file is located. For instance, if your source directory is myapplication on the C drive, blazon the following command at the prompt and press Enter:
At present the prompt should change to C:\myapplication>.
Note:
To modify to a directory on a unlike drive, you must type an extra control: the proper name of the bulldoze. For example, to change to the myapplication directory on the D drive, you must enter D:, as follows:
C:\>D: D:\>cd myapplication D:\myapplication>
If you enter dir at the prompt, you should meet your source file, as follows:
C:\>cd myapplication C:\myapplication>dir Volume in drive C is System Volume Serial Number is F2E8-C8CC Directory of C:\myapplication 2014-04-24 01:34 PM <DIR> . 2014-04-24 01:34 PM <DIR> .. 2014-04-24 01:34 PM 267 HelloWorldApp.java 1 File(south) 267 bytes ii Dir(s) 93,297,991,680 bytes free C:\myapplication>
At present you are ready to compile. At the prompt, type the following command and press Enter.
The compiler has generated a bytecode file, HelloWorldApp.class. At the prompt, type dir to see the new file that was generated equally follows:
C:\myapplication>javac HelloWorldApp.java C:\myapplication>dir Volume in drive C is Organization Volume Serial Number is F2E8-C8CC Directory of C:\myapplication 2014-04-24 02:07 PM <DIR> . 2014-04-24 02:07 PM <DIR> .. 2014-04-24 02:07 PM 432 HelloWorldApp.form 2014-04-24 01:34 PM 267 HelloWorldApp.java 2 File(s) 699 bytes 2 Dir(southward) 93,298,032,640 bytes free C:\myapplication>
At present that yous accept a .class file, you can run your program.
If you encounter bug with the instructions in this step, consult the Mutual Problems (and Their Solutions).
Run the Program
In the same directory, enter the following command at the prompt:
You lot should see the following on your screen:
C:\myapplication>coffee -cp . HelloWorldApp Hullo World! C:\myapplication>
Congratulations! Your program works!
If you encounter problems with the instructions in this step, consult the Common Problems (and Their Solutions).
Source: https://docs.oracle.com/javase/tutorial/getStarted/cupojava/win32.html
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