Extend a generic class in java with a particular type [duplicate]

Question

I'm new in java and I just discovered generics. I thought i understood the principle till i tested this code. I wanted to create a class SortedListOfStrings, extending ArrayList that would insert an element in lexical order in the list.

public class SortedListOfStrings<String> extends ArrayList<String> {
    
    public boolean add(String s) {
        boolean done = false;
        int i;
        for(i=0; i<this.size(); i++) {
            if(get(i).compareTo(s) > 0) {
                this.add(i,s);
                done = true;
            }
        }
        if(!done) {
            this.add(i, s);
        }
        return true;
    }
}

But I caught this error : The method compareTo(String) is undefined for the type String SortedListOfStrings.java line 11

Can someone explain me why I do have it or what I did wrong ?

Thanks