I'm trying to add a string into my array in the 3rd position because I need to do so for a loop I'm executing after it.
ArrayList<String> namesArray = new ArrayList<>();
java.lang.IndexOutOfBoundsException: Invalid index 3, size is 0
When you say
the result is that after the
arrayList.get(n) will have that value. You're trying to arrange things so that
arrayList.get(3) will be
mString. However, an
ArrayList must be a list of consecutive elements; it can't be a "sparse array". That is, for
arrayList.get(3) to exist,
arrayList.get(2) must also exist.
I don't know what you want those values to be (maybe
null?), but you do have to set them. Java's
ArrayList doesn't have an
add method that automatically fills in the gap with a default value. You can add 3
nulls to the array like this: