If? Or ELSE!

Howdy,
Here is my problem, I have to ask the 'user' of the program a yes or no question. They must answer yes or no, therefore a scanner class is sufficient here, done all that. But, now I want my program to tangent in different ways depending on their answer. If they answer no, NO, NO!!!, nO or n, I want all these to work if they answer like this, same for Yes, Y, yes etc.

If they answer yes I want my program to be able to continue, if they answer no, I want it to end how I please. I just don't know whether or not i need to use "if" or "else", or some sort of loop or what?

This may be a very simple problem for you guys but I am new to java, if anyone could give me an answer to these problems It would mean alot, thanks.

Creeeds :-bd

If-else would be easiest :). A regex could maybe work very well.
Lesson: Regular Expressions (The Java™ Tutorials > Essential Classes)
Even though there may be a better and simpler way (not that good when it comes to regex or string stuff, lol).

EDIT:

Example that may be easier. Going to list the steps since it is from my head and not from any code i have made. All steps should be fairly simple to do.
1. Convert the string to lower case (basically just use the method "toLowerCase").
2. Remove whitespaces from the start and end of the string (basically just call the method "trim").
3.
a) Check if it starts with n or no.
b) Check if it starts with y or yes.
4. Check if you only have ! left.
5. If all the checks above comes out true then you should be set to go, otherwise ask again.
Hopefully that would work, but I haven´t tested it, so I don´t know, lol.

lol, I have no idea how to do that.
Would be able to write a quick code for an example?

Thanks

Creeeds

It is easy. To convert the string to lower case:

Code java:

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str = str.toLowerCase();

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To remove whitespaces at the beginning and the end.

Code java:

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str = str.trim();

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Check if a string starts with something:

Code java:

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if (str.startsWith( "something" ))
    // Code here, lol

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The last one I am not sure about, but you could replace the ! character with nothing like this:

Code java:

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str = str.replace("!", "");

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And then check the length with the .length() method of the string. Of course, there may be better ways and I do not have the time to actually check if it works now because I am in a hurry. Hope this cleared things up.