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nope. try to put of the position of e in your first input trend.

I think It should be like this:
Enter a string
Java Girl -my input
Enter an integer position
1 -my input


if it is base 0,...

I am not sure if you have a compilation error with that line. that is not a valid syntax for java 6 and below, I am not sure if you are using java 7 and you compiled that statement successfully.
do...

take a look in the String class of java String (Java Platform SE 7 ) there is a toLowerCase and toUpperCase method in String class. Character class Character (Java Platform SE 7 ) also have those...