Question

I am trying to find what array index position contains part of a string.

FullDirPrt = "a1a" "b2b" "c3c"

String doT ="b2";
int DotPos = Arrays.asList(FullDirPrt).indexOf(doT);

If I search for b2b it returns indexOf. If I search for only b2, it returns -1.

Answer 1

You have to check each item in the array individually, as each array item is a separate string:

String[] full = { "a1a", "b2b", "c3c" };
String doT = "b2";

for(int i = 0; i < full.length; i++) {
    if(full[i].contains(doT)) {
        System.out.println("Found item at index " + i);
    }
}