This post explains how to install Java or check which version is running on your machine. Install on any OS, and learn about the JDK.

The JDK is the development platform for building Java applications. Learn about different JDK versions, then install a JDK in your development environment and use it to compile a Java program.

Oracle has released Java Platform, Standard Edition 7 Update 4 and JavaFX 2.1, Oracle's first releases of the Java Development Kit and JavaFX SDK for Mac OS X.

Java Platform JDK 7u4, JavaFX 2.1, and Netbeans are available to download now, and support OS X 10.7. The Mac port of Java will also be maintained as open source under the OpenJDK project.

As for OpenJDK, Apple says that it plans to contribute most of the components required to properly implement Java SE 7 in Mac OS X. That includes "a 32-bit and 64-bit HotSpot-based Java virtual ...

Oracle has released Java Platform, Standard Edition 7 Update 4 and JavaFX 2.1, Oracle's first releases of the Java Development Kit and JavaFX SDK for Mac OS X.