Java 2 Platform Standard Edition 5.0 Release 3 allows applications and applets developed for the J2SE 5.0 platform to run on Mac OS X v 10.4.2 and soon.
These inform does not change the defaulting version of Java on your Mac from Java 1.4.2 to J2SE 5.0, though Java applications that require J2SE 5.0 may specifically request it.

You can change the favored Java version for applications and applets by using the new Java preference utility.

This utility is installed by the J2SE 5.0 update at /Applications/Utilities/Java/J2SE 5.0.

Installing J2SE 5.0 Release 3

● Get the J2SE 5.0 Update here.
● Double-click the “J2SE50Release3.dmg” disk image file that you downloaded, and it will mount to materialize as a disk in the Finder.
● Open the mounted disk, then double-click the Installer icon.
● Follow the onscreen instructions to complete the installation.