采用Collections.sort 或Google Sort来对文件进行排序，出现
Comparison method violates its general contract 异常，
找了好久，才发现是实现接口Comparator 的类有问题，
在compare中没有处理好两个比较的对象相等的情况
public int compare(T lhs, T rhs); 即 lhs == rhs 时，返回值不是0
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