void (final int index, final Content child) { // Confirm basic sanity of child. checkPreConditions(child, index, false); // Check to see whether this parent believes it can contain this content parent.canContainContent(child, index, false); child.setParent(parent); ensureCapacity(size + 1); if (index == size) { elementData[size++] = child; } else { System.arraycopy(elementData, index, elementData, index + 1, size - index); elementData[index] = child; size++; } // Successful add's increment the AbstractList's modCount incModCount(); }