This is not the Library folder in your home directory, this is the Library folder in the root file system on your main disk.

So in Terminal the command

cd /Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk

should work

This is not the Library folder in your home directory, this is the Library folder in the root file system on your main disk.

So in Terminal the command

cd /Library/Java/JavaVirtualMachines/jdk1.8.0_91.jdk

should work.

For different releases of Java replace jdk1.8.0_91.jdk with the appropriate release.

To list what is in the directory use:

ls /Library/Java/JavaVirtualMachines