[ Thanks to Anonymous for this link.
]
“Java properties (java.lang.Properties) are the most common
method of application configuration in use in Java programming. You
typically use Java properties to determine how an application is
configured on initialization, as well as to determine some types of
runtime behavior. Properties often specify things such as servers
and ports that the application needs to communicate with when
initialized. They also can specify application runtime properties
that determine behavior such as the maximum number of news items to
display on the home page or simply the text to display for the page
title.“Regardless of their many uses, properties are always static.
You define them within the properties file, which you then store
within the file system.”