helo guyz...do you know any sites to recommend where can i find java exercises (exercises w/ answers)..,,,it is our sembreak,,,and i want to do other stuffs bout programming to develop my mind more in programming....

Or join to any of the online programming website ACM is hosting. You won't find the solution for most of the problems, but there are a lot of hints and helps available. Plus, they have a huge collection of problems. You will find them here: http://en.wikipedia.org/wiki/Online_judge