list的三种循环方式

public static void main(String[] args) {
   List<String> list=new ArrayList<String>();
   list.add("123");
   list.add("456");
   list.add("789");
   System.out.println("------经典的for循环-----");
   for (int i = 0; i < list.size(); i++) {
       System.out.println(list.get(i));
   }
   System.out.println("-------Iterate循环--------");
   Iterator<String> iter=list.iterator();
   while(iter.hasNext())
   {
       System.out.println(iter.next());
   }
   System.out.println("-------foreach循环---------");
   for (String string : list) {
     System.out.println(string);
 }
}