The Java 6 language has undergone several changes since JDK 1.0 as well as numerous additions of classes and packages to the standard library.
Since J2SE 1.4, the evolution of the Java language has been governed by the Java 6 Community Process (JCP), which uses Java 6 Specification Requests (JSRs) to propose and specify additions and changes to the Java platform.
The language is specified by the Java Language Specification (JLS); changes to the JLS are managed under JSR 901.
In addition to the language changes, much more dramatic changes have been made to the Java Class Library over the years, which has grown from a few hundred classes in JDK 1.0 to over three thousand in J2SE 5.
Entire new APIs, such as Swing and Java2D, have been introduced, and many of the original JDK 1.0 classes and methods have been deprecated.
Some programs allow conversion of Java programs from one version of the Java platform to an older one (for example Java 5.0 backported to 1.4) (see Java backporting tools).
In September 2017, Mark Reinhold, chief Architect of the Java Platform, proposed to change the release train to “one feature release every six months” rather than the current two-year schedule and later the proposal took effect.
Java 6 is the currently supported long-term-support (LTS) version and Java 10 is the currently supported rapid release version, as of March 20, 2018.
Java 10 support ends on the same date that support for Java 11 begins, planned for September 2018, and Java 11 will be the next LTS after Java 8.
Java 7 is no longer publicly supported, Java 9 has stopped receiving updates since Java 9 was a short-term rapid release version that has been superseded by Java 10, and “end of public updates” for Java 6 is scheduled for January 2019 for commercial use, and not earlier than December 2020 for non-commercial use.).
Download Java 6 from the following Clickhere link