: GJ is an online gaming or instant messenger abbreviation corresponding to good job , sometimes used in a sarcastic manner, and may also be short for grapefruit juice or grape juice. : GJ can also be an abbreviation for GreatestJournal.

GJ (Generic Java) is a superset of the Java programming language which adds support for generic programming. It was designed by the team who had previously created the Pizza programming language language.

GJ was incorporated, essentially unchanged, into the official Java language version 1.5.

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