DIFFERENCE BETWEEN JDK 1.3,1.4,1.5 and 1.6

Can anybody give clear differences between JDK 1.3,1.4,1.5 and 1.6.

You would do well to stop and reflect on the fact that with hundreds, if not thousands, of changes implemented over the years covered by your request, a more specific question will recieve more specific replies.
Had you mentioned having read the release notes, I would not have bothered mentioning them. But they are the standard source for this information. And they (and the documents they link to) are quite comprehensive: allowing you to choose which of the changes you consider most important based on whatever criteria you are using.
But, since you have read them: cite and ask about what you can't understand.
Or stick around and someone will post a link to a site with a 50 word summary you can copy, paste, submit and forget.

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