厳密にはコンストラクタ引数でComparatorを渡し、そのComparatorがnullをサポートしている場合はTreeMapでもnullをキーとして使用できます。

However, we can also customize the ordering of keys. For this, we need to create our comparator class based on which keys in a TreeMap are sorted. Create a new Class named “CustomComparator,” and then ...

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TreeMap is a computer program for analysing host-parasite cospeciation. We respond to Dowling’s (Cladistics, 18: 416-435) recent comparison of TreeMap and Brooks Parsimony Analysis (BPA) by ...