Jdk 多个版本行切换

上传jdk7 和 jdk8 包 安装jdk1.7 和 jdk8 解压

tar -zxvf /package/jdk-7u80-linux-x64.tar.gz

配置jdk变量

vi /etc/profile
export JAVA_HOME=/package/jdk1.7.0_80
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$PATH:$JAVA_HOME/bin

给jdk1.7 、1.8设置序列号

alternatives --install /usr/bin/java java /package/jdk1.7.0_80 3
alternatives --install /usr/bin/java java /package/jdk1.8.0_124 2

选择jdk对应的数字—切换jdk版本

alternatives --config java
There are 3 programs which provide 'java'.
 Selection    Command
-----------------------------------------------
*  1           /package/jdk1.8.0_121/java
  2           /package/jdk1.8.0_121/bin/java
+ 3           /package/jdk1.7.0_80/bin/java
Enter to keep the current selection[+], or type selection number: 2