JAVA - Please complete the method compareBTrees() below:

/*

*/

import binarytree.*;

/** A program that tests the addStringBTrees() and addIntegerBTrees() methods. */ public class CompareBTrees { /** Return a binary tree that is the node-by-node comparison of the two input trees.

The comparison of two empty trees is the empty tree.

The comparison of an empty tree and a non-empty tree is the empty tree.

The comparison of two non-empty trees, btree1 and btree2, is a tree whose root data element is a boolean holding the value btree1.root().equals(btree2.root())

The comparison of two non-empty binary trees is defined recursively using the above three cases.

Another way to describe the result tree is that a node of the result tree holds true if both input trees have that node and their contents are equal, and a node of the result tree holds false if both input trees have that node and their contents are not equal. So the result tree has nodes only at those positions where both input trees have a node. You might say that the result tree has the shape of the "intersection" of the two input trees (compare this with the AddBTrees.addStringBTrees() and AddBTrees.addIntegerBTrees() methods). */ public static BTreeAbstract compareBTrees(BTree btree1, BTree btree2) {

}

// Simple test case for compareBTrees(). public static void main(String[] args) { BTree btree1 = new LinkedBTree<>(10, new LinkedBTree<>(20, new LinkedBTree<>(40), new LinkedBTree<>()), // empty tree new LinkedBTree<>(30, new LinkedBTree<>(50), new LinkedBTree<>(60)));

BTree btree2 = new LinkedBTree<>(10, new LinkedBTree<>(30, new LinkedBTree<>(), // empty tree new LinkedBTree<>(40)), new LinkedBTree<>(20, new LinkedBTree<>(50), new LinkedBTree<>())); // empty tree

BTree btree3 = compareBTrees(btree1, btree2);

System.out.println( btree1 ); System.out.println( btree2 ); System.out.println( btree3 ); BTree2dot.btree2dot(btree1, "btree1"); BTree2png.btree2png("btree1"); BTree2dot.btree2dot(btree2, "btree2"); BTree2png.btree2png("btree2"); BTree2dot.btree2dot(btree3, "btree3"); BTree2png.btree2png("btree3"); } }