![]() You do not just "learn" a specific Java version, like Java 12.It obviously does not work the other way around, say your program relies on Java 13 features that are simply not available under a Java 8 JVM. This means that your Java 5 or 8 program is guaranteed to run with a Java 8-13 Virtual Machine - with a few exceptions you don’t need to worry about for now. Java is special in this regard, as it is extremely backwards compatible. What Is the Difference Between Java Versions? Should I Learn a Specific One?Ĭoming from other programming languages with major breakages between releases, like say Python 2 to 3, you might be wondering if the same applies to Java. OpenJDK 64-Bit Server VM 18.9 (build 11 28, mixed mode) OpenJDK Runtime Environment 18.9 (build 11 28) Now, the version number looks like this: c:\Program Files\Java\jdk11\bin>java -version With the switch to time-based releases with Java 9, the naming scheme also changed, and Java versions aren’t prefixed with 1.x anymore. Java HotSpot(TM) 64-Bit Server VM (build 25.191-b12, mixed mode) Java(TM) SE Runtime Environment (build 1.8.0_191-b12) When you issued the java -version command with these versions, you got an output like this: c:\Program Files\Java\jdk1.8.0_191\bin>java -version So, Java 8 can also be called 1.8, Java 5 can be called 1.5, etc. Java versions before 9 simply had a different naming scheme. To sum things up, you have a mix of practical issues (upgrading your tools, libraries, frameworks) and political issues. Some companies have policies to only use LTS versions and rely on their OS vendors to provide them these builds, which takes time.This is, however, not really an issue, which you’ll learn about in the " Java Distributions" section of this guide. Java se runtime environment 8 update 25 free#Oracle changed the licensing scheme in 2019, though, which caused the Internet to go crazy saying "Java is not free anymore" - and a fair amount of confusion followed.
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