使用迭代函数

class lteratorDemo{

      public static void main(String args[]){

            ArrayList al=new ArrayList();

                  

            al.add("C");

            al.add("A");

            al.add("E");

            al.add("B");

            al.add("D");

            al.add("F");

                  System.out.print("Original contents of al:");

                        lterator itr=al.iterator();

            while(itr.hasNext()){

                  Object element  =itr.next();

                  System.out.print(element + "");

            }

                        System.out.println();

 

                              Listlterator litr =al.listlterator();

                                    while(litr.hasNext()){

                                                System.out.print("Modified contents of al:");

                                                            itr =al.iterator();

                                                      while(it.hasNext()){

                                                              Object element =itr.next();

                                                                              System.out.print(element +"");

                                                      }

                                                                System.out.println();

                                                                        System.out.print("Modified list backwards:");

                                                                                 while(litr.hasPrevious()){

                                                                                        Object element =litr.previous();

                                                                                                  System.out.print(element +"");  

                                                                                  }

                                                                          System.out.println();

                                    }

      }

}