No one person banned you. There's a super-secret algorithm in place that automatically post-bans users that continually post bad content. You were caught by this algorithm.
How were your questions deemed bad? downvotes (or a lack of votes), closure, deletion. As other users have stated, you should follow the directions here in order to work towards being unbanned.
Here are specific problems I see with your questions that would keep me from upvoting them:
Website Mortgage Calculator = JavaScript?: This question is not a good fit for Stack Overflow. It asks what technology to use to build a specific thing. Imagine for a second you're a random internet user, stumbling onto the site through Google. Can you imagine the answer to this question being useful to anyone other than yourself? Or if it is, can you imagine anyone having the specific set of criteria you have for this? Probably not.
Java While and If Else: This question seems a bit too localized for Stack Overflow. You're seeing a specific debugging problem with a specific set of code (99 bottles of beer), and you want someone to help you fix it. That's all well and good, except that once again, the answer to this particular question isn't useful to anyone else. It feels like you wanted to have live debugging help for a really basic problem. This is one of those times where you should bite the bullet and try things. If you don't understand how something works, read up on it, but this question can never really be useful to anyone else.
Java Variable Holder and its value: Read above. Same issue. Debug more, read code, read more. Not a good fit for a knowledge site.
Java Codingbat code should work but doesn't: See above.
Finding larger number within a range: A little more interesting; with appropriate editing, this could be a truth table question. But again, it is looking for specific debugging help on a specific issue that doesn't have a general audience
performing a for loop on a retrieved array: Same thing again. "I need debugging help. I should go to Stack Overflow."
I recognize that it's hard for you to hear this feedback, but without it, you'll likely get unbanned by the system but re-banned after you ask another question.
Stack Overflow is not a help forum. It's a Q & A site. The process of helping you is incidental to the goal of having a site filled with good programming knowledge that is searchable by others.
Your questions all have something in common, they show that you should look into debugging. It's a hard pill to swallow, but you have all the tools at your disposal to solve these problems. If you're not sure how to debug programs, I'd take a look at Debug It!, it's a great book about that very thing. Learn to debug, and six of your questions would never has needed to be asked (and you wouldn't be in the mess you're in now).
I hope you get unbanned, but more than that, I hope you'll take this as a learning opportunity and focus on how to improve your questions so that they're more useful to other people.
