java - what's a simple and elegant way to print arraylist elements separated by comma?

Hi I'm writing code to print all elements from an ArrayList separated by comma, the folllowing is the method I wrote. It works. But i'm wondering if it can be simplified? And is there a more elegant way to print all elements from an ArrayList separated by some delimiter? (e.g. a method that prints an ArrayList of Strings get "Tom, Sherlock, Jack")

Thanks everyone!

public String printMyArrayList() {
    if(mylist.size() == 0)return "";
    else if(mylist.size() == 1)return mylist.get(0).toString();
    else {
        String returnStr = "";
        for (int i = 0; i < mylist.size() ; i++) {
            if(i == 0)returnStr = mylist.get(i).toString();
            else {

                returnStr = returnStr + ", " + mylist.get(i).toString();
            }
        }
        return returnStr;
    }
}