Command to find the file containing the jdk information
Command:
file `which java javac`
Output:
~/ $ file `which java javac`
/usr/bin/java: symbolic link to `/etc/alternatives/java'
/usr/bin/javac: symbolic link to `/etc/alternatives/javac'Command to find the jdk version information
Command and Output
~/ $ file /etc/alternatives/java /etc/alternatives/javac /etc/alternatives/java: symbolic link to `/usr/lib/jvm/java-8-oracle/jre/bin/java' /etc/alternatives/javac: symbolic link to `/usr/lib/jvm/java-8-oracle/bin/javac' ~/ $
Now, you are having Java/JDK version 8 of oracle.