Ubuntu java7 升级到 java8
查看原版本
java -version
显示如下
java version "1.7.0_101"
OpenJDK Runtime Environment (IcedTea 2.6.6) (7u101-2.6.6-0ubuntu0.14.04.1)
OpenJDK 64-Bit Server VM (build 24.95-b01, mixed mode)
安装 opensdk 8
add-apt-repository ppa:openjdk-r/ppa
apt-get update
apt-get install openjdk-8-jdk
列出已经安装的Java版本
update-java-alternatives -l
显示如下:
java-1.7.0-openjdk-amd64 1071 /usr/lib/jvm/java-1.7.0-openjdk-amd64
java-1.8.0-openjdk-amd64 1069 /usr/lib/jvm/java-1.8.0-openjdk-amd64
手动切换版本
update-alternatives --config java
选择java-8-openjdk-amd64即可
There are 2 choices for the alternative java (providing /usr/bin/java).
Selection Path Priority Status
------------------------------------------------------------
0 /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java 1071 auto mode
1 /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java 1071 manual mode
* 2 /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java 1069 manual mode
Press enter to keep the current choice[*], or type selection number: 2