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isFull

Language/Type: Java binary trees implementing IntTree
Related Links:
Author: Robert Baxter

Write a method isFull that returns whether or not a binary tree is full (true, if it is, false if otherwise). A full binary tree is one in which every node has 0 or 2 children. Below are examples of each.

full tree not a full tree 
          +---+
          | 2 |
          +---+
         /     \
     +---+     +---+
     | 3 |     | 1 |
     +---+     +---+
    /     \
+---+     +---+
| 8 |     | 7 |
+---+     +---+

          +---+
          | 7 |
          +---+
         /     \
     +---+     +---+
     | 4 |     | 0 |
     +---+     +---+
    /     \         \
+---+     +---+     +---+
| 9 |     | 2 |     | 8 |
+---+     +---+     +---+

By definition, the empty tree is considered full.

Assume that you are adding this method to the IntTree class as defined below: 

public class IntTree {
    private IntTreeNode overallRoot;
    ...
}
Type your solution here:


This is a partial class problem. Submit code that will become part of an existing Java class as described. You do not need to write the complete class, just the portion described in the problem.

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