Split a alphabetically sorted list into sublists based on alphabets in java

Question

I have a sorted list in java, i just want to split this list into sublists based on the first alphabet at each index of list. For example List contains

{
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Answer 1

Something like this could work.

private List> subListOnFirstLetter(List list) {
    List> result = new ArrayList<>();
    char first = list.get(0).charAt(0);
    List subList = new ArrayList<>();
    for (String element : list) {
        char next = element.charAt(0);
        if (next != first) {
            result.add(subList);
            subList = new ArrayList<>();
        } else {
            subList.add(element);
        }
        first = next;
    }
    return result;
}