Ubuntu系统切换java虚拟机版本
1、查看java版本
其中java版本包括jdk（java开发版本），以及jre（java运行环境），因此我们需要兼顾两者的版本对应，才能够完全，因此先来查看电脑种的jdk版本：
wtq@wtq[~]$ java -versionjava version "1.6.0_45"Java(TM) SE Runtime Environment (build 1.6.0_45-b06)Java HotSpot(TM) 64-Bit Server VM (build 20.45-b01, mixed mode)
再查看电脑中的jre版本：
wtq@wtq[~]$ javac -versionjavac 1.6.0_45
2、修改java版本
我电脑中现在有三个java版本，因此需要选择自己想要的版本进行修改
wtq@wtq[~]$ sudo update-alternatives --config java[sudo] password for wtq: There are 3 choices for the alternative java (providing /usr/bin/java).Selection Path Priority Status------------------------------------------------------------0 /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java 1081auto mode1 /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java 1071manual mode2 /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java 1081manual mode* 3 /usr/lib/jvm/jdk1.6.0_45/bin/java1 manual modePress <enter> to keep the current choice[*], or type selection number: 0update-alternatives: using /usr/lib/jvm/java-8-openjdk-amd64/jre/bin/java to provide /usr/bin/java (java) in auto mode
wtq@wtq[~]$ sudo update-alternatives --config javacThere are 3 choices for the alternative javac (providing /usr/bin/javac).Selection Path Priority Status------------------------------------------------------------0 /usr/lib/jvm/java-8-openjdk-amd64/bin/javac 1081auto mode1 /usr/lib/jvm/java-7-openjdk-amd64/bin/javac 1071manual mode2 /usr/lib/jvm/java-8-openjdk-amd64/bin/javac 1081manual mode* 3 /usr/lib/jvm/jdk1.6.0_45/bin/javac 1 manual modePress <enter> to keep the current choice[*], or type selection number: 0update-alternatives: using /usr/lib/jvm/java-8-openjdk-amd64/bin/javac to provide /usr/bin/javac (javac) in auto mode
这样重新查看java版本就可以了
如果觉得《Ubuntu系统切换jdk版本》对你有帮助，请点赞、收藏，并留下你的观点哦！
