在java.util包中那些种提供了List接口的实现

学习笔记，转自：http://blog.****.net/xiangxiaofeng12/article/details/5734770

      ArrayList 实现了可变大小的数组，使用它的优点就是遍历元素和随机访问元素效率较高。

      使用方法：

         List  对象名 =  new ArrayList（）；

      ArrayList的常用方法：add(objiect o)    ;  size ()  ;  get(int index) ;

                                     remove(object o);

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             public List findListTopic(int page, int boardId) {

                    List list = new ArrayList();
                    for(int i = 0 ; i < 20 ; i++){
                         TopicBean topic = new TopicBean();
                          topic.setTopicId(i+1);
                          topic.setTitle("主题"+i+"的标题");
                          topic.setContent("主题"+i+"的内容");
                          topic.setPublishTime("2010-7-13 12:12:00");
                          topic.setUId(i+20);
                          list.add(topic);
                    }
                     return list;
              }

      public class  TopicDaoImplTest {

            public static void mian(String [] args){

              TopicDao topic = new topicDaoImpl ();

              List listTopic = topic.findListTopic( 1,1);  //( page, boardId)

              for( int i =0;  i < listTopic.size (); i++){

                        Topic topic = (Topic ) listTopic .get (i);

                        System.out.println("=====主题别表-=====")；

                        System.out.println(topic.getTitle () );   

                        System.out.println(topic.getContent () );  

                        System.out.println(topic.getPublishTime () );                   

               }

           }

      }

     ==============================================================================

      LinkedList 类和ArrayList类相比，在插入或删除元素时，LinkedList有更好的性能

     插入、删除首个元素或最后元素时可以使用LinkedList

     用法：  List 对象名 = new LinkedList （）；

                LinkedList 对象名 = new LinkedList （）；  //使用List没有的方法时

     LinkedList常用方法 ： addFirst（object o）;   addLast （object o）; get Fiirst（）；

                                      getLast（）； removeFirst（）；removeLast（）；

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                public List findListReply(int page, int TopicId) {

                      List list = new LinkedList ();
                      for(int i=0; i<list.size (); i++) {
                            ReplyBean reply = new ReplyBean ();
                            reply.setTopicId(i+1);
                            reply.setTitle("回复 ："+i+"的标题");
                            reply.setContent("回复 ："+i+"的内容");
                            reply.setPublishTime("2010-7=13 16:00:00");
                            reply.setReplyId(i);
                            list.add(reply);
                    }
                    return list; 
                }

            public class ReplyDaoImplTest{

                 public static void main (String [] args) {

                         ReplyDao replyDao = new ReplyDaoImpl ();

                         List replyList = replyDao.findListReply(1,1);

                         for ( int i = 0 ; i < replyList.size() ; i++){

                                Reply reply =  ( Reply) replyList.get(i);

                                System.out.println("=========回复信息==========")；

                                System.out.println( reply.getTitle () );

                                System.out.println( reply.getContent() );  

                                System.out.println( reply.getPublishTime() );      

                         }

                 }

           }