This is some wishful thinking, really, but there is Java acceleration built into the Samsung S3C6400 processor which iPhonistas believe could possibly feasibly allow Java to run natively on the iPhone. Since Steve said that Java eats rotten goat tongues, don’t expect to see any Java any time soon, but it’s nice to know that we can, potentially, at some point in time, see Java in Safari.
The Java acceleration is called Jazelle and runs on ARM native processors. It can be enabled with a software upgrade, so the possibility is always there.