How does Linux change default Java

How to change the default JAVA for Linux. Actually Linux offers a command to settle down default values including JAVA.

sudo update-alternatives --remove-all java
sudo update-alternatives --remove-all javac
sudo update-alternatives --remove-all javaws

Now when trying to install new alternatives I get the following:

sudo update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk/bin/java 1