X285: Binary Tree Height Exercise

The height of a binary tree is the length of the path to the deepest node. An empty tree has a height of 0, a tree with one node has a height of 1, and so on. Write a recursive function to find the height of the binary tree pointed at by root.
Here are methods that you can use on the BinNode objects:
   interface BinNode {
      public int value();
      public void setValue(int v);
      public BinNode left();
      public BinNode right();
      public boolean isLeaf();
   }

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