How should I use classes

Question

I understand what classes are but how and when should I use them? For example what classes might I have in a programme that has a login screen etc.

Answer 1

You can create class namely login,which attributes can be userid,password & methods like check availability of userid & password.. then what to do if password is wrong... you can create methods by your functionality requirements..

I jst want to say,"METHODS DECIDE ACTION ON DATA,& DATA IS NOTHING BUT ATTRIBUTE OF CLASS",So methods & data bind together & make an entity which we known as class.