java based programming challenges [closed]

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Is there any website which provides core java based programming challenges that tests programming logic?

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Project Euler

It's not Java specific, but a good Programming Challenge site for any language.

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The following sites have some good programming challenges. There is nothing like a challenge based on a language. Hope these links help you.

Top coder
Spoj
Project Euler
Code Chef

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I add CodingBat to the sites mentioned here. And project Euler get also my recommendation.

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Check out CodeChef

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Robocode.

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The Facebook Careers website has a dozen or so programming puzzles which can be solved in a variety of languages, Java 1.5 among them.

I highly recommend giving these a shot, some of the problems are deceptively difficult and test your algorithm knowledge/design much more than anything specific to any one language.

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Try this one :) http://projecteuler.net/ when you solve the current problem you can compare your solution to others.