What is Java?

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Java is a technology that allows software designed and written just once for an idealized “virtual machine” to run on a variety of real computers, including Windows PCs, Macintoshes, and Unix computers.

On the web, Java is quite popular on web servers, used “under the hood” by many of the largest interactive websites. Here it serves the same role that PHP, ASP or Perl might, although traditionally Java has been used for larger-scale projects....