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[Tutorial] How To Compile Java Programs Through Windows Command Prompt

Although many Java developers compile Java programs within IDE it is also essential skill for them to learn how to compile directly from windows shell. In this tutorial I will show you how to install Java SDK and compile your code from within Windows Command Line.


To get started follow steps below:

Step 1: The first thing you need to do is download JDK from Oracle website in order to have the latest version of Java installed on your computer.

Step 2: Once download is completed lunch the installation and follow on-screen instruction. One important thing you need to pay attention to is the location where you have installed JDK, so make sure you write it down somewhere.

Step 3: Now we need to create a main directory where we will be holding all Java files. For example, you can create a folder at c:\java and place .java files and project within that folder.

Step 4: Now click Start menu, type system in search box and press Enter on your keyboard.

Step 5: From window that appears, inside left pane select Advanced system settings.

Step 6: A new window will open with Advanced tab selected. At the bottom of that window click on Environment Variables… button.

Step 7: Under System variables section scroll down to the variable Path and select it.

Step 8: Now click on Edit button.

Step 9: Now you need to include a path which you have remembered from Step 2 and type it at the end of Variable value field. Make sure you close it with ;. So in my case that path will be C:\Program Files\Java\jdk1.7.0_07\;

Note: If you add a wrong path in here you will get following error when you try to compile: ‘javac’ is not recognized as an internal or external command, operable program or batch file.

Step 10: Click OK three times to save all changes.

Step 11: Now click Start menu, type cmd inside search field and press Enter on your keyboard.

Step 12: Now type cd \java which is the path of folder we created in Step 3.

Step 13: Type javac NewJavaFileName.java where NewJavaFileName.java represent a file name which you want to compile. Press Enter to start compilation.

Step 14: Now go back to your personal Java folder and you should see a new .class file.

There you go. Now you know how to compile Java from Windows Command Prompt.

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