Install and use firewalld on Ubuntu
Firewalld is one of the Linux firewall management tool and it is available on the in the Ubuntu's default repositories, therefore it is available to
be installed from these repositories using the apt packaging system.
Strings functions in Golang
List of Golang string functions tested example and short description.
The strings package provides many useful string-related functions.
For loop examples in Golang
How to write a for loop using Golang programming language. Similar with other programing languages, the basic for loop has three components separated by semicolons.
How to show open database connections in MySQL
How to show open database connections in MySQL using show status and show processlist command.
Abstract keyword in Java
The abstract keyword is used in Java for abstraction. The abstraction is the process of selecting data and displaying only the relevant details to the object. If helps to reduce the programing complexity and the efort.
All keywords in Java
Keywords are special words in the programing language which have reserved use in the language. Keywords may not be used as identifiers in Java; for example you cannot declare a field whose name is a keyword.
