$ sudo update-alternatives --config java
Selection Path Priority Status ------------------------------------------------------------ 0 /usr/lib/jvm/java-8-oracle/jre/bin/java 1071 auto mode 1 /usr/lib/jvm/java-6-openjdk-amd64/jre/bin/java 1061 manual mode 2 /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java 1051 manual mode * 3 /usr/lib/jvm/java-8-oracle/jre/bin/java 1065 manual mode Press enter to keep the current choice[*], or type selection number:
change the edition of java on ubuntu.
原文：http://www.cnblogs.com/ordili/p/6675466.html