A working example on how to config postfix with gmail smtp server to send email directly from linux command line and tested on vagrant vm with ubuntu precise 32.

Java multithreading programming demo.

A javascript calendar.

How to pretty print json usually for better visibility.

Common regular expression symbols, characters, and usage.

How to dynamically change html form action value based on user input.

Java parse common data files such as csv, json, yaml, xml, ini, properties and etc.

Java serialization and deserialization examples.

Java reflection examples.

How to highlight a web element after it is located in selenium webdriver.