java Comparator为什么没完成排序？

Question

int top = Integer.parseInt(map.get("top")); List<NovelNews> novelNewsList = NovelMongo.GetAllNovel(); Collections.sort(novelNewsList, new Comparator() { public int compare(Object obj0, Object obj1) { NovelNews novel0 = (NovelNews) obj0; NovelNews novel1 = (NovelNews) obj1; return Long.toString(novel1.getHeat()).compareTo(Long.toString(novel0.getHeat())); } }); for(int i = 0; i <= top - 1; i++){ System.out.println(novelNewsList.get(i).getHeat()); }

Answer 1

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return Long.toString(novel1.getHeat()).compareTo(Long.toString(novel0.getHeat()));

String.compareTo(String arg);是按照字典排序的规则，而不是比较值的大小,示例如下：
23
2231
223
123
想要按照Long型值的大小排序：

...
return novel0.getHeat().compareTo(novel1.getHeat());