Helper script to switch between JDKs given the path to JDK.
./update-java-alternatives.sh path/to/jdk
gayan@deb:~$ ./update-java-alternatives.sh ~/libs/jdk/jdk1.8.0_77/
Using JDK: /home/gayan/Downloads/libs/jdk/jdk1.8.0_77
Do you want to update java (y/n)? y
Do you want to update javac (y/n)? y
Do you want to update jdb (y/n)? y
Do you want to update javaws (y/n)? y
Do you want to update jar (y/n)? y
Do you want to update jdeps (y/n)? y