] Mac OS X is the only mass-market operating system that
] comes complete with a fully configured and ready-to-use
] Java Development Kit. Professional Java developers are
] increasingly turning to the feature-rich Mac OS X as the
] operating system of choice for cross-platform Java
] development projects on the Macintosh and other
] platforms. Mac OS X includes the full version of J2SE
] 1.4.x, preinstalled with the Java Development Kit (JDK)
] and the HotSpot virtual machine (VM), so you don't have
] to download, install, or configure anything.

Apple's Mac OS X Java Development