import java.util.ArrayList;import java.util.List;import java.util.ListIterator;public class TestDemo {    public static void main(String[] args) {        List
     
       list = new ArrayList
      
       ();        list.add(1);        list.add(5);        list.add(2);        list.add(4);        list.add(3);        System.out.println("----------for循环-----------");        int size = list.size();        for(int i=0;i
       
         it = list.iterator();        while(it.hasNext()){            System.out.print(it.next() + " ");        }        System.out.println();                System.out.println("--------双向迭代器---------");        ListIterator
        
          lte = list.listIterator();        while(lte.hasNext()){            System.out.print(lte.next() + " ");        }        System.out.println();                while(lte.hasPrevious()){            System.out.print(lte.previous()+" ");        }    }}