difference between y = ++x and y = x++

Can some one properly explain difference between y = ++x and y = x++

If we expand the operators :- a = x++ //since plus is after x so we get a = x x = x+1 while for : a = ++x (since x is later we have to assign later) x = x+1 a = x (where x is increment so tenchically a=x+1)

Tránh lỗi "ConcurrentModificationException" khi xoá phần tử đang duyệt trong arraylist

https://stackoverflow.com/questions/18448671/how-to-avoid-concurrentmodificationexception-while-removing-elements-from-arr

accepted

Use an Iterator and call remove():

Iterator<String> iter = myArrayList.iterator();

while (iter.hasNext()) {
    String str = iter.next();

    if (someCondition)
        iter.remove();
}