How to remove java5 from ubuntu 11.04?

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http://stackoverflow.com – I want to remove java5 completely from my ubuntu 11.04 system. On executing java -version, it showing - java version "1.5.0" gij (GNU libgcj) version 4.4.5 Copyright (C) 2007 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. How can I remove it? (HowTos)