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i mean some decent problems
http://projecteuler.net/ http://www.codechef.com/ These are two very popular sites.
i want something regarding the basics.....like they code chef has nthin to do with the basics............let's say i wanna explore language
I see, sorry I didn't quite understand the question or what level you are at, there are very basic questions on codechef but if that's not what you are looking for I guess you should do some online learning before attempting challenges. There are several sites online for learning java. www.wibit.com is good for covering Java from the ground up.
it's under construction nd sorry i m to be blamed coz i dint make it clear
http://www2.cs.uic.edu/~sloan/CLASSES/202-course-info/pset1/pset1.html - I think these should do the trick!
Everyone asks these q's and no one posts the oracle trail... http://docs.oracle.com/javase/tutorial/
my COEN class used to practice on javabat.com
codingbat.com has a lot of problems, but they tend to be geared to the beginner. here's the link for all the problems that we did in my intro to java class at San Jose State University: http://horstmann.com/sjsu/fall2012/cs46a/
thanks all i think i l leave this question unresolved so that a getter a "longer" list