public void add(int index, E obj) {
		if (length == array.length){
			int newlength = array.length*2;
			E[] copyarray = ( E[] ) new Object[newlength];
			for (int i = 0; i < index; i++){
				copyarray[i] = array[i];
			}
			for (int i = index; i < length; i++){
				copyarray[i+1] = array[i];
			}
			copyarray[index] = obj;
			length++;
			array = copyarray;
		}else{
			for (int i = length; i > index; i--){
				array[i] = array[i - 1];
			}
			array[index] = obj;
			length++;
		}
	}