justin@Justin-Lenovo-V570:~$ dpkg -l |grep jre
ii  default-jre                          1:1.6-43ubuntu2                         Standard Java or Java compatible Runtime
ii  default-jre-headless                 1:1.6-43ubuntu2                         Standard Java or Java compatible Runtime (headless)
ii  icedtea-6-jre-cacao                  6b24-1.11.1-4ubuntu3                    Alternative JVM for OpenJDK, using Cacao
ii  icedtea-6-jre-jamvm                  6b24-1.11.1-4ubuntu3                    Alternative JVM for OpenJDK, using JamVM
ii  openjdk-6-jre                        6b24-1.11.1-4ubuntu3                    OpenJDK Java runtime, using Hotspot JIT
ii  openjdk-6-jre-headless               6b24-1.11.1-4ubuntu3                    OpenJDK Java runtime, using Hotspot JIT (headless)
ii  openjdk-6-jre-lib                    6b24-1.11.1-4ubuntu3                    OpenJDK Java runtime (architecture independent libraries)