Question: JAVA 15. Suppose IntBTNode is a BTNode (from Chapter 9) with integer data. Write a new static method of the IntBTNode class to meet the

JAVA

15. 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 count42(IntBTNode root) // Precondition: root is the root reference of a binary tree (but // NOT NECESSARILY a search tree). // Postcondition: The return value indicates how many times 42 appears // in the tree. NOTE: If the tree is empty, the method returns zero.

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.

22. 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. Make the method as efficient as possible (do not visit nodes unnecessarily). void insert42(BTNode root) // Precondition: root is the root reference of a binary SEARCH tree. // Postcondition: One copy of the number 42 has been added to the binary // search tree.

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