Java中Comparator接口的用法

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Comparator OrderName = new Comparator(){
    public int compare(Object o1, Object o2){
     BookType b1=(BookType)o1;
     BookType b2=(BookType)o2;
     return (b1.getName().hashCode()-b2.getName().hashCode());
    }
   };
  
   Collections.sort(list,OrderName); 
   Collections.reverse(list);