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you can first convert that in char array and then compare each character
already i have gone through that src.zip and rt.jar ,its ok but im not sutisfied.
Each String in Java is a CharacterSequence. So you can compare and manipulate two strings the way you want it.
However I would recommend you to not do so on your own. The inbuilt methods take care of all the things that you would have never imagined are required to be taken care of (e.g. languages and locales).
However if you still want to do it on your own and are asking for code samples then the best place to get "inspired" from is JDK itself! You can check the code of the string methods provided in src.zip shipped as part of the JDK distribution to see how it does its magic.
