Question

I am doing a project in which I require btree or b+tree data structure. Does anyone know of an existing implementation of btree or b+tree (with insert, delete, search algorithms)? It should accept string as input and form btree or b+tree of these string.

Answer 1

In the lack of details about the problem that you need to solve, I am going to allow myself to suggest an alternative solution that might solve your problem: use a red/black tree instead.

The red/black tree can be thought of as a b-tree, as explained on Wikipedia:

A red-black tree is similar in structure to a B-tree of order 4, where each node can contain between 1 to 3 values and (accordingly) between 2 to 4 child pointers. In such B-tree, each node will contain only one value matching the value in a black node of the red-black tree, with an optional value before and/or after it in the same node, both matching an equivalent red node of the red-black tree […]

Java has two built-in classes, TreeMap and TreeSet, providing red/black trees. None of these will take a string as input and grow a tree from it, but you might be able to implement something similar “around” one of those classes.