How to check the JDK version of a class file
When running a Java application it is mandatory that the JRE version to match or to be higher that the JDK version used to compile the application.
You will get the "Unsupported major.minor version 52.0" error when trying to run an Java 1.8 application using a lower version of Java.
XML and HTML sitemap file in SEO
The sitemap's a file place on your website that will enable Google and other search engines to crawl better and understand the structure of the site. Sitemaps also tell search engines which pages on your site are most important. It's a binder of your website's content.
How to use JSON Object in JavaScript
JSON is part of JavaScript programming language and is the main choise when it comes to data manipulation in JavaScript.
JSON is used from storing data, transfering data between client and server to configuring data.
How to fix apt lock-frontend error in Ubuntu
How to fix the E: Could not get lock /var/lib/dpkg/lock-frontend - open (11: Resource temporarily unavailable) error.
How to change DNS settings from command line
The command line tool used to change the DNS settings is netsh which allows you to configure just about any aspect of your network connections in Windows. In order to use the tool the command line needs to be started as Administrator.
How to change computer's IP address from command line
The command line tool used to change the IP address is netsh which allows you to configure just about any aspect of your network connections in Windows. In order to use the tool the command line needs to be started as Administrator
