How to start learn Ruby

Hey I want's to know How can i start to learn Ruby. And what's the requirement for it I am a SCJP.

There is no requirement whatsoever... well, beyond a text editor and a ruby interpreter.

I heartily recommend Chris Pine's "Learn to Program" available online as a tutorial, or from the Pragmatic Bookshelf:
http://pine.fm/LearnToProgram/

Contrary to Java, that requires a solid grounding before you can start using it, Ruby is pretty easy to approach. As long as you understand OOP (and you're willing to understand some functional-style programming), you can begin with Ruby by just goofing around and reading introductory tutorials. If you want to be systematic, the "pickaxe" book is still one of my favorites (http://pragprog.com/titles/ruby3/programming-ruby-1-9). You can also find an outdated HTML version of it on the web for free, if you want to check it out first (http://ruby-doc.org/docs/ProgrammingRuby/).

Why's (poignant) Guide to Ruby is also a great resource.

(Did anybody ever figure out what happened to him?)

_why as an identity is no more (and we all miss him a lot). The real person behind _why's identity is now on to other things.

I'd say that one requirement is to forget some of the things Java taught you (us). You'll need the willingness to approach OO from a different angle, because Ruby feels decidely "not" Java at times. If you don't allow yourself to "let go of Java" for a time, you'll end up writing Java code with Ruby syntax... a travesty if there ever was one!

Why's Poignant Guide to Ruby was the first real look I had at the language, a great (if not a little strange) introduction. Glad that it's still available.

Hey which book is best for the beginers.

I used the pixaxe book to learn Ruby, but have found both Beginning Ruby and The Well Grounded Rubyist to be well worth the time.