Is it possible to add some information (description) to a class or to a method
=> Yes Its possible to comment block (Javadoc style).
For example:
/**
This method is used for bla bla bla...
@author Paresh Mayani
@Date 16th April
**/
public void display()
{
.....
.....
}
And this above comment will popup in Yellow notes while you are implementing.