change_jdk

 一.change_jdk 

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if [ x$1 == x ]; then     echo default jdk1.7     exit 0 fi   if [ x$1 == x1.6 ]; then     echo change jdk to 1.6     export JAVA_HOME=/usr/lib/jvm/jdk1.6.0_37     export JRE_HOME=$JAVA_HOME/jre     export CLASSPATH=.:$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATH     export PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$PATH     java -version fi   if [ x$1 == x1.7 ]; then     echo change jdk to 1.7     export JAVA_HOME=/usr/lib/jvm/java-7-openjdk-amd64     export JRE_HOME=$JAVA_HOME/jre     export CLASSPATH=.:$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATH     export PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$PATH     java -version fi   if [ x$1 == x1.8 ]; then     echo change jdk to 1.8     export JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64     export JRE_HOME=$JAVA_HOME/jre     export CLASSPATH=.:$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATH     export PATH=$JAVA_HOME/bin:$JRE_HOME/bin:$PATH     java -version fi

 二.运行

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gatsby@ubuntu:~/workspace$ source change_jdk 1.8 change jdk to 1.8 openjdk version "1.8.0_275" OpenJDK Runtime Environment (build 1.8.0_275-8u275-b01-0ubuntu1~16.04-b01) OpenJDK 64-Bit Server VM (build 25.275-b01, mixed mode) gatsby@ubuntu:~/workspace$ java -version openjdk version "1.8.0_275" OpenJDK Runtime Environment (build 1.8.0_275-8u275-b01-0ubuntu1~16.04-b01) OpenJDK 64-Bit Server VM (build 25.275-b01, mixed mode) gatsby@ubuntu:~/workspace$