Thank you hendri54 
.
This solves problem of finding methods of them, although i wanted a different way.
But It is not interactive. Like those in other languages
a. and tab gives alot of possible methods interactively but I didnt got , I wanted to get interactively find a way in julia.
I am thinking how julia is thinking to make it interactively to find methods, also without going to type typeof to every variables, like other languages does.
Yes I use tab if forgot some methods but it is arbitary to every and difficult to remember every classes methods .
but although this is ok for other peoples.