J2SE's related naming and version number (J2se Naming and Versioning, translation)
(http://java.sun.com/j2se/naming_versioning_5_0.html) Java technology has been launched 9 years ago, and the launch of J2SE (2nd Generation Java Platform) has been 5 years. In view of the long change of J2SE, the next release version of J2SE is changed from 1.5 to 5.0 to better reflect the intensity, stability, scalability, and stability of J2SE. This is the provision of the official naming and version number of J2SE (also known as tiger). The platform is named: Java (TM) 2 Platform Standard Edition 5.0 or J2SE (TM) 5.0. Products included in the platform *: JDK (TM) 5.0 JRE 5.0 Due to the popularity in the Java developer, the name of the Java Development Kit is restored to "JDK" by "SDK". * Note: JDK (TM) and JRE full name: J2se Development Kit 5.0 J2se Runtime Environment 5.0 For more details on naming and version name, please refer to: http://java.sun.com/j2se/j2se-namechange .html
