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Oracleからダウンロードして入れてもいいけど、update-altanativesで--install とかするのが面倒だったので自分用メモ。

$ sudo add-apt-repository ppa:webupd8team/java
$ sudo apt-get update
$ sudo apt-get install oracle-java8-installer


$ update-alternatives --config java
There are 2 choices for the alternative java (providing /usr/bin/java).

  Selection    Path                                            Priority   Status
* 0            /usr/lib/jvm/java-8-oracle/jre/bin/java          1072      auto mode
  1            /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java   1071      manual mode
  2            /usr/lib/jvm/java-8-oracle/jre/bin/java          1072      manual mode

Press enter to keep the current choice[*], or type selection number: