Just add following to your .bash_aliases:
alias resetjdkpath=' PATH=`echo $PATH | sed -Ee 's/[/]usr[/]lib[/]jvm[^:]+//g' | sed -Ee 's/:+/:/g'` ' alias orjdk7=' resetjdkpath JAVA_HOME=/usr/lib/jvm/java-7-oracle J2SDKDIR=${JAVA_HOME} J2REDIR=${JAVA_HOME}/jre PATH=${JAVA_HOME}/bin:${JAVA_HOME}/db/bin:${JAVA_HOME}/jre/bin:$PATH DERBY_HOME=${JAVA_HOME}/db java -version ' alias orjdk8=' resetjdkpath JAVA_HOME=/usr/lib/jvm/java-8-oracle J2SDKDIR=${JAVA_HOME} J2REDIR=${JAVA_HOME}/jre PATH=${JAVA_HOME}/bin:${JAVA_HOME}/db/bin:${JAVA_HOME}/jre/bin:$PATH DERBY_HOME=${JAVA_HOME}/db java -version ' alias orjdk9=' resetjdkpath JAVA_HOME=/usr/lib/jvm/java-9-oracle J2SDKDIR=${JAVA_HOME} J2REDIR=${JAVA_HOME}/jre PATH=${JAVA_HOME}/bin:${JAVA_HOME}/db/bin:${JAVA_HOME}/jre/bin:$PATH DERBY_HOME=${JAVA_HOME}/db java -version ' alias opjdk8=' resetjdkpath JAVA_HOME=/usr/lib/jvm/java-8-openjdk-amd64 J2SDKDIR=${JAVA_HOME} J2REDIR=${JAVA_HOME}/jre PATH=${JAVA_HOME}/bin:${JAVA_HOME}/db/bin:${JAVA_HOME}/jre/bin:$PATH DERBY_HOME=${JAVA_HOME}/db java -version ' 
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