Question: java program +---+ | 1 | +---+ / / +---+ +---+ | 2 | | 3 | +---+ +---+ / / /

java program  +---+ | 1 | +---+ / \ / \ +---+ +---+ | 2 | | 3 | +---+ +---+ / / \ / / \ +---+ +---+ +---+ | 4 | | 5 | | 6 | +---+ +---+ +---+

Write a method that could be added to the IntTree class and that returns the total number of nodes in the tree.

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