Topic: 关于集合

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1.关于集合 Copy to clipboard
Posted by: ice0819
Posted on: 2008-11-01 20:15

List<T> list=new ArrayList<T>;与ArrayList<T> list=new ArrayList<T>;有什么区别呀？前者有点在哪？
2.Re:关于集合 [Re: ice0819] Copy to clipboard
Posted by: andy_wang_5
Posted on: 2008-11-03 09:02

前者使用了upcase(上塑类型转化)
3.Re:关于集合 [Re: andy_wang_5] Copy to clipboard
Posted by: ditty
Posted on: 2008-11-03 10:41

前者通用性好些。
4.Re:关于集合 [Re: ice0819] Copy to clipboard
Posted by: junz04
Posted on: 2008-11-04 22:07

这样做具有很好的灵活性，如果将来程序需要重构的话，比如说需要使用LinkedList而不是ArrayList的话，只需改成List<T> list=new LinkedList<T>;就可以实现了，其他代码都不用更改。
5.Re:关于集合 [Re: ice0819] Copy to clipboard
Posted by: JiafanZhou
Posted on: 2008-11-10 17:57

Under almost all circumstances, we should use the former one, i.e. List<T> list=new ArrayList<T>; instead of ArrayList<T> list=new ArrayList<T>;

This is the underpinning idea of OO polymorphism.

My one cent.
Jiafan

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