sl33k@sl33k-laptop:~$ sudo dpkg --list | grep -i jdk
iU  default-jdk                           1:1.6-43ubuntu2                                     Standard Java or Java compatible Development Kit
ii  default-jdk-doc                       0.43ubuntu2                                         Standard Java or Java compatible Development Kit (documentation)
ii  icedtea-6-jre-cacao                   6b24-1.11.3-1ubuntu0.10.04.1                        Alternative JVM for OpenJDK, using Cacao
ii  openjdk-6-doc                         6b31-1.13.3-1ubuntu1~0.12.04.2                      OpenJDK Development Kit (JDK) documentation
ii  openjdk-6-jdk                         6b24-1.11.3-1ubuntu0.10.04.1                        OpenJDK Development Kit (JDK)
ii  openjdk-6-jre                         6b24-1.11.3-1ubuntu0.10.04.1                        OpenJDK Java runtime, using Hotspot JIT
ii  openjdk-6-jre-headless                6b24-1.11.3-1ubuntu0.10.04.1                        OpenJDK Java runtime, using Hotspot JIT (headless)
ii  openjdk-6-jre-lib                     6b24-1.11.3-1ubuntu0.10.04.1                        OpenJDK Java runtime (architecture independent libraries)
sl33k@sl33k-laptop:~$