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);