Java - Enhanced For Loop never ending

Question

This code is producing an endless loop:

        for (String element : friendSet) {
        resultNum ++;
        System.out.println("  Result # " + resultNum + " = " + element);
        System.out.print(" friendSet.size() = " + friendSet.size());
    }

friendSet.size() = 2923 but the results keep climbing to tens of thousands until I force the program to stop. For example:

friendSet.size() = 2923  Result # 7652 = Charlie
friendSet.size() = 2923  Result # 7653 = Jamie
friendSet.size() = 2923  Result # 7654 = Smith

What is going on?

Answer 1

Behind the scenes: foreach loops in java just use the objects iterator.

Is friendSet some kind of custom iterable collection? if so, your iterator implementation is not correct.