JDK版本1.6和6.0到底指什么

Both version numbers (1.6.0 and 6) are used to identify this release of the Java Platform. Version 6 is the product version, while 1.6.0 is the developer version. The number 6 is used to reflect the evolving level of maturity, stability, scalability and security of Java SE.

2个版本号(1.6.和 6)都用来标识这个版本的Java平台。 版本6 是产品号， 1.6.0是开发的版本号。 6这个数字用来反映Java 便准版的成熟、稳定、可测量和安全的的程度。

Java SE keeps the version number 1.6.0 (or 1.6) in some places that are visible only to developers, or where the version number is parsed by programs. As mentioned, 1.6.0 refers to exactly the same platform and products numbered 6. Version numbers 1.6.0 and 1.6 are used at:
Java SE 在某些只对开发者可见的地方保持了版本号1.6.0(或者1.6)，或者一些被程序解析的版本号的地方。提示：1.6.0 与平台和产品名为6的完全相同。