JDK版本1.6和6.0到底指什麼

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個版本號(1.6.和 6)都用來標識這個版本的Java平臺。 版本6 是產品號， 1.6.0是開發的版本號。 6這個數字用來反映Java 便準版的成熟、穩定、可測量和安全的的程度。

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 在某些只對開發者可見的地方保持了版本號1.6.0(或者1.6)，或者一些被程序解析的版本號的地方。提示：1.6.0 與平臺和產品名爲6的徹底相同。