Well you can always put a "5" as a key in a map, "5" is after all a string, even you can have 5 as a key in a map as the compiler will autobox it into Integer. A key in the map needs to be an object whether String "5" or Integer 5 or anything else...
well i think i need a break.actually my exams are going on and a lot of cryptography , industrial management , distributed computing .... they are just playing cricket inside my mind.
unable to think properly
anyways thanks alot ankit