How to check Oracle Java version if multiple versions of Java installed on Ubuntu

Question

I have both OpenJDK and Oracle Java installed on my Ubuntu. If the activated java is OpenJDK, is there a way to check the version of Oracle java in bash shell

Answer 1

you should follow bellow two commands

1. sudo update-alternatives --config java

In their show the all already installed Java versions like below

2.gedit ~/.bashrc

`export JAVA_HOME=/path/to/jdk/folder

usually /usr/java/jdk or /usr/lib/java/jdk

export PATH=$PATH:$JAVA_HOME/bin`

add to bash