Eg; I want my TreeSet / HashMap to store 1,19,3,4,2,0 in that order since it is the order they are added to the map.Eg; I want my TreeSet / HashMap to store 1,19,3
阅读背景：
如何告诉java的TreeSet或HashMap其contenst被索引的顺序是插入顺序（不想要LinkedHashMap）？
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