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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. Oracles free, GPL-licensed, production-ready OpenJDK JDK 19 binaries for Linux, macOS, and Windows are. From Java 6, the version name is Java SE X. Download and install the latest open-source JDK.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 se development kit