Composition of Java applet source files

The Java applet has three source files, and the suffix name is. Java,.class and. Jar.

The only. java file allows you to read and modify (and, of course, you need to know a little Java programming), but. java files cannot be applied directly, and you must compile them into a. class file with a compiler to insert the page directly. In fact, most of the authors of Java applets are reluctant to expose the. java file to everyone, so most of what we can find on the Internet is that we cannot modify the. class file that can only be used directly.

and. jar file, if you have it, and add archive= "*.jar" to the <applet>, you can speed up loading in the latest browsers.