Question: JAVA 18. Suppose IntBTNode is a BTNode (from Chapter 9) with integer data. Write a new static method of the IntBTNode class to meet the

JAVA

18. Suppose IntBTNode is a BTNode (from Chapter 9) with integer data. Write a new static method of the IntBTNode class to meet the following specification. public static int sum(IntBTNode root) // Precondition: root is the root reference of a binary tree. // Postcondition: The return value is the sum of all the data in all the nodes. // NOTES: The return value for the empty tree is zero.

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