A properties file contains a list of keys and values. You can load it with a Properties object and an InputStream and save it with a Properties object and an OutputStream. There is not anything more to it.
Please don't post the same question in multiple forums. It creates duplicate conversations and wastes the time of the people trying to help you.
The soul is dyed the color of its thoughts. Think only on those things that are in line with your principles and can bear the light of day. The content of your character is your choice. Day by day, what you do is who you become. Your integrity is your destiny - it is the light that guides your way. - Heraclitus
Where all the women are strong, all the men are good looking and all the tiny ads are above average: