基础回顾—list遍历4种

（1）for each

for(bject o :list)

   {

   }

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（2）Iterator

Iterator iter = list.iterator();

   while(iter.hasNext()){

      Object o = iter.next();

   }

 

（3）loop without size

int size = list.size();

   for(int i=0;i<size;i++){

      Object o= list.get(i);

   }

 

（4）loop with size

for(int i=0;i<list.size();i++){

      Object o= list.get(i);

   }