To determine if Java is enabled in your web browser: Windows Mac Windows Operating Systems Firefox 52 or newer Click on the Tools or Firefox menu > Add-ons. Click on the Plugins button. Verify there is a Java (TM) Platform plug-in installed.

With our online Java compiler, you can edit Java code, and view the result in your browser. Run » public class Main { public static void main(String[] args) { System.out.println("Hello World!"); } } Hello World! Try it Yourself » Click on the "Try it Yourself" button to see how it works.

To verify that Java can run in your browser, we attempt to display a series of Java applets in this web page. Each Java applet will appear as a RED rectangle that displays the Java version and the Java vendor. We also show the HTML tags that were used to create each of the applets.