If you want to dive deep into Java programming and become a software developer, I recommend you to learn this Java course on Udemy. How to write, compile and run a hello world Java program for beginners.Understand 9 features of Java programming language.Major versions were released after every 2 years, however the Java SE 7 took 5 years to be available after its predecessor Java SE 6, and 3 years for Java SE 8 to be available to public afterward.Since Java SE 10, new versions will be released very six months. Developers and end-users are encouraged to update to more recent Java SE versions that remain available for public download in order to continue receiving public updates and security enhancements. Existing Java SE 7 downloads already posted as of April 2015 will remain accessible in the Java Archive on the Oracle Technology Network. From Java 6, the version name is Java SE X. After April 2015, Oracle will no longer post updates of Java SE 7 to its public download sites.This could make confusion for someone, so keep in mind that version 1.5 and version 5.0 are just two different version names for only one thing.

Internal version is continuous from previous ones (1.5 after 1.4), but the external version has a big jump (5.0 for 1.5). From versions 1.5, Sun introduces internal and external versions.From versions 1.2 to 1.4, the platform is named as J2SE (Java 2 Standard Edition).Versions 1.0 and 1.1 are named as JDK (Java Development Kit).From the table above we can see that the naming and the version number have been changing over times:

Java 7 update 5 download