Java JDK Names....

Java version History

code names :

JDK 1.0    -   OAK
J2SE 1.2   -   Playground
J2SE 1.3   -   Kestrel
J2SE 1.4   -   Merlin   ----(added assert,regex,exception changing,loggingAPI..etc)
J2SE 5.0   -   Tiger   ----(added generics,metadata,autoboxing,enums,swings,varargs,enhanced for
                                    loop,static imports,concurrency..etc)
Java SE 6  -   Mustang  -----(added annotations,navigablemap,navigablesets,console classes....)

Java SE 7  -   Dolphin