遍历list

 List list = new ArrayList();
 list.add("aa");
 list.add("bb");
 list.add("cc");

1.for-iter循环

 for (Iterator iter = list.iterator(); iter.hasNext();) {
  String str = (String)iter.next();
  System.out.println(str);
 }

2.迭代器用于while循环

 Iterator iter = list.iterator();
 while(iter.hasNext()){
  String str = (String) iter.next();
  System.out.println(str);
 }

3.for each循环

for(Object str:list){
                  System.out.println(str);
             }

4.

  for(int i = 0;i<list.size();i++){
   System.out.print(list.get(i)+"/t");
  }(注意：Object[] objs=(Object[])list.get(i);)