arrayList.h 1

疑问：

1、element[--listSize].~T();*/ //So the space of array of element will decrease too???????

注意事项:

1、Pay attention to the range of the parameters,especially i.e Index

2、/*this->element = theArrayList.element;*/ //wrong,cause just copy the first elementT类型赋值重载需深复制when theArrayList is deleted,this->element also is deleted

3、After using the other/external function,do not forget to refresh Revelant Variables.

4、Ingore that the quantity relationship between the two sizes,due to the PREJUDICE

i.e ,void changeLength1D(T *&start, int oldSize, int newSize)

收获：

1、Merge similar FUNCTIONs intoto ONE

2、void arrayList::output(ostream& out) const{}

copy(element, element + listSize, ostream_iterator(cout, " "));//Don't forget T

3、//overload<<

4、Invoke the existing funtion/interface(STL booster) to 

a decrease the code

b increasse the coupling in order to make it easier to burn the bug by modifying a single function