容器总结

Collection接口

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      Set接口  { HashSet类| TreeSet类      }  

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      List接口 { ArrayList类| LinkedList类  }

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      Map接口{  HashMap类| TreeMap类   }

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Iterator接口

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      用法：Iterator i = (new LinkedList()).iterator();

               while(i.hasNext()) {

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

               }

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Collections类

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     说明:静态类

     用法：Collections.sort(new LinkedList());

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Comparable接口

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     用法：实现Comparable接口重写comparaTo()方法。

              达到比较类的对象的目的。

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Generic

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     用法: List<Integer> l = new LinkedList<Integer>();

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

             Map.put("A", 1);       Map.put("B", 2);

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