Custom collection type: Trees

[Col-E]

Idea:

interface Tree<T> {
    T data();
    Tree<T> parent();
    List<Tree<T>> children();
}

May want a keyed variant too:

interface KeyedTree<K, T> extends Tree<T> {
    Map<K, Tree<T>> keyedChildren();
}

Assuming both are implemented, having an add(...) type would be nice on the core Tree type. But this would mean the keyed type would then have to derive K from T if it wanted to adapt to a put(...) sort of operation....

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What degree of detail in offered implementations should be offered? For instance, some types of trees: https://www.educative.io/blog/data-structures-trees-java

[Col-E]

https://github.com/Col-E/ExtraCollections/commit/a813bf87f50c1a9ebe7df1ba2ba6ed0a3ed76fc0