Answers for "const injava"

remove apache2 from ubuntu

#stop the apache2 service 
$ sudo systemctl stop apache2 

#remove apache2 packages
$ sudo apt-get purge apache2 apache2-utils apache2-bin apache2.2-common

# cleanup
$ sudo apt-get autoremove

# check if the apache has been removed:
#1- following command line should return a blank line
$ which apache2   
# 2- following command line should return apache2: Failed to start apache2.service: Unit apache2.service not found.
$ sudo systemctl start apache2

restart apache ubuntu

# Restart Apache 2 server on Linux/Unix
sudo service apache2 restart

# Start Apache 2 server on Linux/Unix
sudo service apache2 start

# Stop Apache 2 server on Linux/Unix
sudo service apache2 stop

restart apache ubuntu

# Restart apche 2 server.
sudo service apache2 restart 
or
sudo systemctl restart apache2


# Gracefully reloading is a bit faster, and there's no downtime
sudo service apache2 reload

java const

//final variable value can't be changed
private final int VAR = 0;

what does const mean in java

Although reserved as a keyword in Java, const is not used and has 
no function.