java中List Set Map使用

@Test

        public void run()

       {

              

              ArrayList<String> list= new ArrayList<String>();

              list.add( "美女");

              list.add( "帅哥");

              list.add( "芙蓉姐姐" );

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

                     String str=list.get(i);

                     System. out.println(str);

              }

              System. out.println("==============================================" );

               for(String str:list)

              {

                     System. out.println(str);

                     

              }

              System. out.println("==================使用迭代器========================" );

              Iterator<String> it=list.iterator();

               while(it.hasNext())

              {

                     System. out.println(it.next());

                     

              }

       }

       

       

        @Test

        public void run1()

       {

              Set<String>set= new HashSet<String>();

              set.add( "aaaaaaaa");

              set.add( "bbbbbbbb");

              set.add( "cccccccc");

              set.add( "dddddddd");

              Iterator <String> iset=set.iterator();

               while(iset.hasNext())

              {

                     System. out.println(iset.next());

                     

              }

       }

        @Test

        public void run2()

       {

              

              Map<String,Integer> map= new HashMap<String,Integer>();

              map.put( "name", 1);

              map.put( "Height", 175);

              map.put( "Weight", 68);

              Set<String>set=map.keySet();

               for (String key:set) {

                     Integer value=map.get(key);

                     System. out.println(key +"==>>" +value);

              }

              Set<Entry<String,Integer>> entrys=map.entrySet();

               for(Entry<String,Integer> entry :entrys)

              {

                     System. out.println(entry.getKey()+entry.getValue());

                     

              }

              

       }