Zing is available in Java SE levels 8.0, 7.0 and 6.0 which corresponds to the OpenJDK internal version scheme 1.8.0, 1.7.0 and 1.6.0.
For most use cases, you only need to know the required Java SE level for your application to decide which Zing version to install.
If your application documentation for instance lists Java 1.7.0_131 as requirement, you need to download the latest ZVM version of Java SE level 7.0 from the Zing download page. Please note, that in addition to the ZVM package you also need to download the ZST package on the same page.
If an application documentation emphasizes a requirement to a specific Java SE update level within one of those three SE levels, like 8u111 (1.8.0_111) with the focus on the 111, the reason for that might be a security fix or a bugfix specifically addressing a Java SE API method used by the application.
The Zing Release Notes contain information about security fixes which were adopted from OpenJDK into Zing to address a known CVE. Major bugfixes regarding Java SE API methods are also listed. If that information is not sufficient and you need more information about the corresponding Java SE update level of the Zing version you are using, please contact Azul Customer Support.
The version numbering scheme for Zing (ZVM) follows the numbering scheme used for Ubuntu Linux. For example Zing version 15.05.1.0 denotes with the first two numbers the major version, here 15.05, where 15 stands for the year 2015 and 05 for the month of May. The 3rd and 4th numbers are the minor version, 1.0 in this example. The version numbering of ZST (Zing System Tools) is independent from ZVM and Java SE. Generally, all previous ZVM versions can be run on the latest ZST. If you already have an ZST installed and need to find out if that older version is compatible with a ZVM version, take a look at the Zing ZST-ZVM Version Compatibility table.