How to Install Java on an iPhone

1. Turn on your jailbroken iPhone or iPod Touch (see Resources section). Make sure you are on either a 3G network or on a Wi-Fi connection. To do this, press 'Settings' and then 'Wi-Fi' to find your closest network. Enter in the security passcode, and you will be connected to a much faster network than even the 3G speeds of the iPhone.

2. Press the 'Cydia' application on your home screen. Cydia is an app store for the 'Open iPhone' and gives you more customization options and apps that Apple will not allow on the AppStore.

3. Wait as Cydia loads and downloads all of its latest packages. Press the 'Search' button on the lower right side and type in the word 'Java.' A few results will come up, with 'iPhone/Java' being the top result. Press on that app.

4. Press 'Install' on the top right corner of the next screen, and the app will be downloaded and installed. You will now have access to the many different Java-based tools.