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size

Language/Type: Java binary trees

Write a method named size that returns the total number of nodes in a binary tree. Your method accepts as its parameter a TreeNode that refers to the root of the tree. For example, the following tree contains 8 nodes, so if a variable named tree refers to its root, the call of size(tree) would return 8: 

(6 (3 (1) (4)) (2 (6) (4 / (0))))

Assume that you are interacting with TreeNodes as defined below: 

public class TreeNode {
    public int data;
    public TreeNode left;
    public TreeNode right;
    
    public TreeNode() { ... }
    public TreeNode(int data) { ... }
    public TreeNode(int data, TreeNode left, TreeNode right) { ... }
}
Method: Write a Java method as described, not a complete program or class.

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