import Java.util.ArrayList;import java.util.Iterator;import java.util.List;public class ArrayTest{ public static void main(String[] args) {  List
     
       lstint = new ArrayList
      
       ();  lstint.add(1);  lstint.add(2);  lstint.add(3);   // Iterator遍历一  Iterator
       
         iterator = lstint.iterator();  while (iterator.hasNext())  {   int i = (Integer) iterator.next();   System.out.println(i);  }   // Iterator遍历二  for (Iterator
        
          it = lstint.iterator(); it.hasNext();)  {   int i = (Integer) it.next();   System.out.println(i);  }   // for循环  for (int i = 0; i < lstint.size(); i++)  {   System.out.println(lstint.get(i));  }   // for循环加强版  for (Integer i : lstint)  {   System.out.println(i);  } }}