今天一同事采用Collections.sort 來對文件進行排序，出現
Comparison method violates its general contract 異常，
找了好久，才發現是實現接口Comparator 的類有問題，
在compare中沒有處理好兩個比較的對象相等的情況
public int compare(T lhs, T rhs); 即 lhs == rhs 時，返回值不是0
Comparison method violates its general contract
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Comparison method violates its general contract!
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