Two days ago the official hard-float Oracle Java 7 JDK has been announced on the official Raspberry Pi blog. Prior to this there was only the OpenJDK implementation which was lacking performance.

Furterhmore the Raspberry Pi Foundation announced that future Raspbian images would ship with. Oracle Java by default.

If you want to give it a spin you can install the JDK with:

$ sudo apt-get update && sudo apt-get install oracle-java7-jdk