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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:
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