About Java 2 Platform, Standard Edition (J2SE) Development Kit (JDK) 5.0

From Sun Microsystems: Java 2 Platform Standard Edition (J2SE) software is the premier platform for rapidly developing and deploying secure, portable applications that run on server and desktop systems. J2SE 5.0 is a significant release including many new features and updates while preserving compatibility and stability. This is the official Java Software Development Kit from Sun Microsystems.