Java How to Program, Early Objects, 11th Edition

37.3 New Version String Format

Prior to Java 9, JDK versions were numbered 1.X.0_updateNumber where X was the major Java version. For example,

• Java 8’s current JDK version number is jdk1.8.0_121 and

• Java 7’s final JDK version number was jdk1.7.0_80.

This numbering scheme has changed. JDK 9 initially will be known as jdk-9. Future minor version updates will add new features, and security updates will fix security holes. These updates will be reflected in the JDK version numbers. For example, in 9.1.3:

• 9—is the major Java version number

• 1—is the minor version update number and

• 3—is the security update number.

So 9.2.5 would indicate the version of Java 9 for which there have been two minor version updates and five total security updates (across ...