Practical tips:

Whether you dig out an old Samsung Star from a drawer or run J2ME Loader on a folding phone, the magic of tapping, swiping, and exploring Java worlds is still alive. Go find your favorite JAR file—just make sure it says "240x400" and "Touch".

Developers would create their games using Java ME development tools, such as Eclipse or NetBeans, and then package them into JAR files. These files could be easily transferred to mobile devices via Bluetooth, infrared, or USB, and installed using the device's built-in installer.